8.2

СМЯНА НА ПЛОЧКИ
import java.util.Scanner;

public class main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double collectedMoney = Double.parseDouble(scan.nextLine());
        double width = Double.parseDouble(scan.nextLine());
        double lenght = Double.parseDouble(scan.nextLine());
        double triangleSide = Double.parseDouble(scan.nextLine());
        double triangleHeight = Double.parseDouble(scan.nextLine());
        double priceForTiles = Double.parseDouble(scan.nextLine());
        double price = Double.parseDouble(scan.nextLine());
        double tiles = (triangleSide * triangleHeight) / 2;
        double needTiles = Math.ceil((width * lenght) / tiles) + 5;
        double endPrice = needTiles * priceForTiles + price;
        double leftMoney = Math.abs(collectedMoney - endPrice);
        if (collectedMoney >= endPrice) {
            System.out.printf("%.2f lv left", leftMoney);
        } else {
            System.out.printf("You'll need %.2f lv more", leftMoney);
        }
    }
}

МАГАЗИН ЗА ЦВЕТЯ
import java.util.Scanner;

public class main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double chrysanthemums = Double.parseDouble(scan.nextLine());
        double roses = Double.parseDouble(scan.nextLine());
        double tulips = Double.parseDouble(scan.nextLine());
        String season = scan.nextLine();
        String holiday = scan.nextLine();
        double chrysanthemumsInSummer = 2.00 * chrysanthemums;
        double chrysanthemumsInWinter = 3.75 * chrysanthemums;
        double rosesInSummer = 4.10 * roses;
        double rosesInWinter = 4.50 * roses;
        double tulipsInSummer = 2.50 * tulips;
        double tulipsInWinter = 4.15 * tulips;
        double chrysanthemumsInSummerH = (chrysanthemumsInSummer * 0.15) + chrysanthemumsInSummer;
        double chrysanthemumsInWinterH = (0.15 * chrysanthemumsInWinter) + chrysanthemumsInWinter;
        double rosesInSummerH = (0.15 * rosesInSummer) + rosesInSummer;
        double rosesInWinterH = (0.15 * rosesInWinter) + rosesInWinter;
        double tulipsInSummerH = (0.15 * tulipsInSummer) + tulipsInSummer;
        double tulipsInWinterH = (0.15 * tulipsInWinter) + tulipsInWinter;
        double price = 0;
        if ((season.equals("Summer") || season.equals("Spring")) && holiday.equals("N")) {
            price += rosesInSummer + chrysanthemumsInSummer + tulipsInSummer;
        } else if ((season.equals("Summer") || season.equals("Spring")) && holiday.equals("Y")) {
            price += rosesInSummerH + chrysanthemumsInSummerH + tulipsInSummerH;
        }
        if ((season.equals("Winter") || season.equals("Autumn")) && holiday.equals("N")) {
            price += rosesInWinter + chrysanthemumsInWinter + tulipsInWinter;
        } else if (season.equals("Winter") || season.equals("Autumn") && holiday.equals("Y")) {
            price += rosesInWinterH + chrysanthemumsInWinterH + tulipsInWinterH;
        }
        if (season.equals("Spring") && tulips > 7) {
            price = price - (price * 0.05);
        }
        if (season.equals("Winter") && roses >= 10) {
            price = price - (price * 0.10);
        }
        if (tulips + chrysanthemums + roses > 20) {
            price = price - (price * 0.20);
        }
        price += 2;
        System.out.printf("%.2f", price);
    }
}

ОЦЕНКИ
import java.util.Scanner;

public class main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int all = Integer.parseInt(scan.nextLine());
        double failed = 0;
        double average = 0;
        double good = 0;
        double exelent = 0;
        double total = 0;
        for (int i = 0; i < all; i++) {
            double grade = Double.parseDouble(scan.next());
            total += grade/all;
            if (grade < 3) {
                failed++;
            } else if (grade >= 3 && grade <= 3.99) {
                average++;
            } else if (grade >= 4 && grade <= 4.99) {
                good++;
            } else if (grade >= 5) {
                exelent++;
            }
        }
        exelent = (exelent * 100) / all;
        good = (good * 100) / all;
        average = (average * 100) / all;
        failed = (failed * 100) / all;
        System.out.printf("Top students:%.2f%% %n", exelent);
        System.out.printf("Between 4.00 and 4.99: %.2f%% %n", good);
        System.out.printf("Between 3.00 and 3.99: %.2f%% %n", average);
        System.out.printf("Fail:%.2f%% %n", failed);
        System.out.println("Avarege: " + total);
    }
}