It shows:
13
1
42
3.5
16.666666666666668
but I can't finish the task

package com.codegym.task.task06.task0612;
/*
Calculator
*/
public class Calculator {
public static int plus(int a, int b) {
int sum = a + b;
return sum;
}
public static int minus(int a, int b) {
int diff = a - b;
return diff;
}
public static int multiply(int a, int b) {
int prod = a * b;
return prod;
}
public static double divide(int a, int b) {
double res = (double)a / (double)b;
return res;
}
public static double percent(int a, int b) {
double per = ((double)b * 100)/(double)a;
return per;
}
public static void main(String[] args) {
System.out.println(plus(6, 7));
System.out.println(minus(8, 7));
System.out.println(multiply(6, 7));
System.out.println(divide(7, 2));
System.out.println(percent(150, 25));
}
}