Purchase Receipt

public class Problem1 {

    public static void main(String[] args) {
        System.out.println(getCost(1, 1, 1, 1)); // Should be 1021.787
        System.out.println(getCost(8, 3, 4, 5)); // Should be 3721.2572
        System.out.println(getCost(10, 3, 4, 8)); // Should be 4775.8565
        System.out.println(getCost(8, 2, 10, 10)); // Should be 7811.7972
    }

    public static double getCost(int drives, int software, int phones, int pens) {
        double driveCost = 49.95 * drives;

        if (drives > 10) {
            driveCost -= driveCost * .1;
        }

        else if (drives > 5) {
            driveCost -= driveCost * .05;
        }

        double softwareCost = Math.max(0, software * 25 - phones * 10);

        double phoneCost = 399 * phones;

        double penCost = 0;

        if (pens == 1) {
            penCost = 500 * 1;
        }

        else if (pens == 2) {
            penCost = 450 * 2;
        }

        else if (pens == 3) {
            penCost = 400 * 3;
        }

        else if (pens == 4) {
            penCost = 350 * 4;
        }

        else if (pens >= 5) {
            penCost = 300 * pens;
        }

        return (driveCost + softwareCost + phoneCost + penCost) * 1.06;
    }
}