/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.math.BigDecimal;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		test(15.05, 9.03, 40);
		test(15.00, 9.00, 40);
		test(14.95, 8.97, 40);
		test(14.90, 8.94, 40);
		test(14.85, 8.91, 40);
	}
 
	public static void test(Double oldPrice, Double price, int expected) {
		int discount = getPriceDifferenceInPercentage(oldPrice, price);
		String message = "Discount between " + oldPrice + " EUR and " + price + " EUR: " + discount + "% off";
		if (discount == expected) {
			System.out.println("OK! " + message);
		} else {
			System.out.println("FAIL! " + message + ", expected: " + expected + "% off");
		}
	}
 
    public static int getPriceDifferenceInPercentage(Double oldPrice, Double price) {
            // Convert doubles to decimals with scale of 2 to make precise calculation
            BigDecimal oldPriceDecimal = new BigDecimal(oldPrice).setScale(2, BigDecimal.ROUND_HALF_UP);
            BigDecimal priceDecimal = new BigDecimal(price).setScale(2, BigDecimal.ROUND_HALF_UP);
 
            BigDecimal percentage = oldPriceDecimal.subtract(priceDecimal).divide(oldPriceDecimal, 2, BigDecimal.ROUND_DOWN);
            return percentage.multiply(new BigDecimal(100)).intValue();
    }	
}

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