Question

This method will return a double value that equals to the balance + 10% of balance

How can I get a 10 percent of a balance in java?

Answer 1

public class TenPercent {
  
   //Since, x % of a value = value* (x /100)
   //So, 10 % of a value = value* (10 /100)
   //that is equal to value* 0.1
  
   // this function assumes the balance value is double
   // it takes the balance and adds 10% of balance to it as follows
  
   public static double addTenPercent(double balance) {
       return balance+balance*0.1;
   }
   // this function does the same assuming balance is integer
   // (double) is used to cast int value.. this converts integer value to double
   public static double addTenPercent(int balance) {
       return (double)balance+(double)balance*0.1;
   }

   public static void main(String[] args) {
       // TODO Auto-generated method stub
      
       int balance1=1000;
       double balance2 =1000;
       System.out.println("10% added to the balance is ->" +addTenPercent(balance1));
       System.out.println("10% added to the balance is ->" +addTenPercent(balance2));

   }

}

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Above code contains two functions, one assumes balance to be integer and the other double.

Basic idea remains the same.

Percentage of a value is given as ..

Let's say x % of y = y * ( x/100)

So, 10% of y = y * (10/100)

                     = y*0.1

Below is the output of the above code..

thanks