Computer Firm Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class ComputerFirm {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(reader.readLine());
        double totalRate = 0;
        double totalSales = 0;

        for (int i = 1; i <= n; i++) {
            int comps = Integer.parseInt(reader.readLine());
            int rate = comps % 10;
            int sales = comps / 10;
            totalRate += rate;

            if (rate == 3){
                totalSales += sales * 0.50;
            } else if (rate == 4){
                totalSales += sales * 0.70;
            } else if (rate == 5){
                totalSales += sales * 0.85;
            } else if (rate == 6){
                totalSales += sales;
            }
        }

        double average = totalRate / n;
        System.out.printf("%.2f%n",totalSales);
        System.out.printf("%.2f",average);
    }
}