Percentage Maths magic

Percentage tricks

Percentages can be done mentally both accurately and rapidly using this cool math trick.
You can solve percentage problems mentally.Become a genius !

You have to learn below tables in order to master percentage and it problems.

Percentage Basics
(1/2)	50%		(1/20)	5%
(1/3)	33(1/3)%		(1/25)	4%
(1/4)	25%		(1/50)	2%
(1/5)	20%		(3/8)	37(1/2)%
(1/6)	16(2/3)%		(5/8)	62(1/2)%
(1/7)	14(2/7)%		(4/7)	57(1/7)%
(1/8)	12(1/2)%		(5/7)	71(3/7)%
(1/9)	11(1/9)%		1	100%
(1/10)	10%
(1/11)	9(1/11)%
(1/12)	8(1/3)%
(1/13)	7(9/13)%
(1/14)	7(1/7)%
(1/15)	6(2/3)%
(1/16)	6(1/4)%

Question 1: Convert percentage into fraction
i) 157(1/7)%

Solution:

157(1∕7)

=100%+57(1/7)%

=1+4/7

=11/7 Ans

Question 2: If 44(4/9) % of a number is added to itself then result becomes 650.Find the original number.
Solution:
44(4/9)%
=4*11(4/9) %
=4*(1/9)
=4/9 %

In percentage,denominator always denotes original number and numerator is result %.

so as per question 4+9=13
13 units =650
1 units=50
so original number is =9*40=450 ans.

Question 3: In an election,10 % of the voters did not cast their votes,11(1/9)% of the votes out of voting done were considered invalid.The winner got 75% of the valid votes and won by 2000 votes.Find out the total number of voters in the voting list.

[ Try to solve this within 30 seconds ]

Solution:

Let total number of voter be 100

100
| -10 ( 10% voter did not cast)
90
| -10 [119(1/9)% =1/9 and 1+9=10 ]
80

    80
  /      \
75% 25%

Difference of 75% and 25% is 50%.

50% of 80=2000 (given)
40 ---->2000
1------> 50

Then 100 ---> 50 * 100=5000 Answer

AngularJS application with Oracle database Tutorial

I am going to show you how to connect angularJS with Oracle database sing java-servlet and read data in JSON format.

CREATE TABLE employee

( empno number(10) NOT NULL,

  ename varchar2(50) NOT NULL,

  job varchar2(50)

);

Java model class (Employee.java)

package com.devyan;

public class Employee {

       int empno;

       String ename;

       String job;

      

    public Employee(int empno, String ename, String job) {

        this.empno = empno;

        this.ename = ename;

        this.job = job;

    }

       public int getEmpno() {

             return empno;

       }

       public void setEmpno(int empno) {

             this.empno = empno;

       }

       public String getEname() {

             return ename;

       }

       public void setEname(String ename) {

             this.ename = ename;

       }

       public String getJob() {

             return job;

       }

       public void setJob(String job) {

             this.job = job;

       }     

}

Database Connection Class ( Mydatabase.java)

package com.devyan;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

public class Mydatabase {

 static Connection con;

 

  public static Connection getCon(){

   

    try {

      Class.forName("oracle.jdbc.driver.OracleDriver");

      con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","SYSTEM","oracle");

    } catch (ClassNotFoundException e) {

      // TODO Auto-generated catch block

      e.printStackTrace();

    } catch (SQLException e) {

      // TODO Auto-generated catch block

      e.printStackTrace();

    }

   

    return con;

  }

 

}

AngularJsServlet.java

It will used database connectivity with Oracle and convert data in JSON format

package com.devyan;

import java.io.*;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ArrayList;

import java.util.logging.Level;

import java.util.logging.Logger;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.*;

import javax.servlet.http.*;

import org.json.JSONArray;

import com.google.gson.Gson;

public class AngularJsServlet extends HttpServlet {

       public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

             response.setContentType("application/json");

             try {

                    /* TODO output your page here. You may use following sample code. */

                    // Mydb db = new Mydb();

                    PrintWriter out = response.getWriter();

                    Connection con = Mydatabase.getCon();

                    ArrayList<Employee> al = new ArrayList<Employee>();

                    try {

                           Statement stmt = con.createStatement();

                           ResultSet rs = stmt.executeQuery("select * from HIBERNATE.Employee");

                           while (rs.next()) {

                                 Employee userobj = new Employee(rs.getInt("empno"), rs.getString("ename"), rs.getString("job"));

                                 al.add(userobj);

                           }

                           JSONArray arrayObj = new JSONArray(al);

                           String json = new Gson().toJson(arrayObj);

                           response.getWriter().write(json);

                    } catch (SQLException ex) {

                           System.out.println();

                           Logger.getLogger(AngularJsServlet.class.getName()).log(Level.SEVERE, null, ex);

                    }

             } catch (Exception e) {

                    e.printStackTrace();

             }

       }

}

Angular JS application (index.html)

    <html>

        <head>

            <title>TODO supply a title</title>

            <meta charset="UTF-8">

            <meta name="viewport" content="width=device-width, initial-scale=1.0">

            <style>

                    table, th , td  {

                      border: 1px solid grey;

                      border-collapse: collapse;

                      padding: 5px;}

                    table tr:nth-child(odd) {

                                   background-color: #f1f1f1;

                           }

                                 table tr:nth-child(even) {

                                   background-color: #ffffff;

                                 }

                    </style>

        </head>

        <script src="http://cdnjs.cloudflare.com/ajax/libs/angular.js/1.2.1/angular.min.js"></script>

      <script>

    var app = angular.module('myApp', []);

    app.controller('myCtrl', function($scope, $http) {

      // email = $scope.email;

      // psw = $scope.psw;

      $http({

        method: "GET",

        url: "http://localhost:8085/AngularJSDemo/devil"

       

      }).then(function mySuccess(response) {

          // a string, or an object, carrying the response from the server.

          $scope.myRes = response.data.myArrayList;

          console.log('Successful' +response);

          $scope.statuscode = response.status;

        }, function myError(response) {

          $scope.myRes = response.myArrayList;

          console.log('Failure' +response);

      });

    });

    </script>

    </head>

    <body>

    <div ng-app="myApp">

            <div ng-controller="myCtrl">

        

              <!-- {{statuscode}}-->

                <div ng-repeat="x in myRes">

                <!--    <h3>{{x.map.empno + " : " +x.map.ename+ " : "+x.map.job}}</h3>-->

                 

                  

                </div>

                <h3>AngularJS application with Oracle database</h3>

                <table>

                <tr><td>Employee No</td><td>Employee Name</td><td>Job</td></tr>

                                 <tr ng-repeat="x in myRes">

                                       

                                     <td>{{ x.map.empno }}</td>

                                     <td>{{ x.map.ename | uppercase }}</td>

                                     <td>{{ x.map.job }}</td>

                                 </tr>

                           </table>

                

              </div>

    </div>

    </body>

    </html>

Hibernate Tutorial