Java application for compound interest

Program:
 
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     import java.io.*;
     import java.util.*;
     public class ci
     {
     public void calculate( int p, int t, int r, int n)
   
 {
    double amount = p*Math.pow( 1 + (r / n), n*t);
    double interest =amount - p;
    System.out.println( "ci is " +interest);
    System.out.println( "Amount is " + amount);
    }
    }