Help me in solving SUGARCANE problem

My issue

My code

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(;
        int t = scanner.nextInt(); // number of test cases
        for (int i = 0; i < t; i++) {
            int n = scanner.nextInt(); // input integer for each test case
            // Your code here
            int a = 50*n;
            int b = (2*((20/100)*a));
            int c = ((30/100)*a);

Problem Link: SUGARCANE Problem - CodeChef

What is the mistake in this code? Because i am getting wrong answers.