Can't passed by the Hidden TestCase #3 and #4

Question

https://www.sololearn.com/coach/22?ref=app

// I've done following code in Java for the above codeCoach.

import java.util.Scanner;
public class Program
{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int colors = sc.nextInt();
int colorsCost = colors *5;
int projectCost = colorsCost +40;
int storeTax = projectCost *10/100;
int totalCost = storeTax +projectCost;
System.out.println(totalCost);
}
}

Answer 1

use double instead of int for variables since a division is used.
then round up the result and output an int.

System.out.println((int)Math.ceil(totalCost));

Math.ceil() to round up
(int) to cast double to int.

Answer 2

I've no approach in math.ciel yet.