Bank Charges

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        double baseFee = 10;
        double checkFee;
        int checks;
        double monthFee;

        System.out.println("How many checks did you do this month?");
        checks = scanner.nextInt();

        if (checks >= 60)
        {
            checkFee = 0.04 * checks;
            monthFee = baseFee + checkFee;
            System.out.println("Bank's service fees for this month: $" + monthFee);
        }
        else if (checks >= 40)
        {
            checkFee = 0.06 * checks;
            monthFee = baseFee + checkFee;
            System.out.println("Bank's service fees for this month: $" + monthFee);
        }
        else if (checks >= 20)
        {
            checkFee = 0.08 * checks;
            monthFee = baseFee + checkFee;
            System.out.println("Bank's service fees for this month: $" + monthFee);
        }
        else
        {
            checkFee = 0.10 * checks;
            monthFee = baseFee + checkFee;
            System.out.println("Bank's service fees for this month: $" + monthFee);
        }
    }
}