12. Trade Commissions

import java.util.Scanner;

public class  TradeCommissions {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String town = scanner.nextLine();
        double profit = Double.parseDouble(scanner.nextLine());

        double commission = 0;

        if (town.equals("Sofia")) {
            if (profit > 0 && profit <= 500) {
                commission = 0.05;
            } else if (profit > 500 && profit <= 1000) {
                commission = 0.07;
            } else if (profit > 1000 && profit <= 10000) {
                commission = 0.08;
            } else if (profit > 10000) {
                commission = 0.12;
            }
        } else if (town.equals("Varna")) {
            if (profit > 0 && profit <= 500) {
                commission = 0.045;
            } else if (profit > 500 && profit <= 1000) {
                commission = 0.075;
            } else if (profit > 1000 && profit <= 10000) {
                commission = 0.1;
            } else if (profit > 10000) {
                commission = 0.13;
            }
        } else if (town.equals("Plovdiv")) {
            if (profit > 0 && profit <= 500) {
                commission = 0.055;
            } else if (profit > 500 && profit <= 1000) {
                commission = 0.08;
            } else if (profit > 1000 && profit <= 10000) {
                commission = 0.12;
            } else if (profit > 10000) {
                commission = 0.145;
            }
        }

        double sum = profit * commission;

        if (sum > 0) {
            System.out.printf("%.2f\n", sum);
        } else {
            System.out.println("error");
        }
    }
}

ИЛИ:

import java.util.Scanner;

public class  TradeCommissions {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String town = scanner.nextLine();
        double profit = Double.parseDouble(scanner.nextLine());

        double commission = 0;

        switch (town) {
            case "Sofia" -> {
                if (profit > 0 && profit <= 500) {
                    commission = 0.05;
                } else if (profit > 500 && profit <= 1000) {
                    commission = 0.07;
                } else if (profit > 1000 && profit <= 10000) {
                    commission = 0.08;
                } else if (profit > 10000) {
                    commission = 0.12;
                }
            }
            case "Varna" -> {
                if (profit > 0 && profit <= 500) {
                    commission = 0.045;
                } else if (profit > 500 && profit <= 1000) {
                    commission = 0.075;
                } else if (profit > 1000 && profit <= 10000) {
                    commission = 0.1;
                } else if (profit > 10000) {
                    commission = 0.13;
                }
            }
            case "Plovdiv" -> {
                if (profit > 0 && profit <= 500) {
                    commission = 0.055;
                } else if (profit > 500 && profit <= 1000) {
                    commission = 0.08;
                } else if (profit > 1000 && profit <= 10000) {
                    commission = 0.12;
                } else if (profit > 10000) {
                    commission = 0.145;
                }
            }
        }

        double sum = profit * commission;

        if (sum > 0) {
            System.out.printf("%.2f\n", sum);
        } else {
            System.out.println("error");
        }
    }
}

ИЛИ:

import java.util.Scanner;

public class  Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String town = scanner.nextLine();
        double profit = Double.parseDouble(scanner.nextLine());

        double commission =
                town.equals("Sofia") ?
                        (profit > 0 && profit <= 500 ? 0.05 : profit > 500 && profit <= 1000 ? 0.07 : profit > 1000 && profit <= 10000 ? 0.08 : profit > 10000 ? 0.12 : 0) :
                        town.equals("Varna") ?
                                (profit > 0 && profit <= 500 ? 0.045 : profit > 500 && profit <= 1000 ? 0.075 : profit > 1000 && profit <= 10000 ? 0.1 : profit > 10000 ? 0.13 : 0) :
                                town.equals("Plovdiv") ?
                                        (profit > 0 && profit <= 500 ? 0.055 : profit > 500 && profit <= 1000 ? 0.08 : profit > 1000 && profit <= 10000 ? 0.12 : profit > 10000 ? 0.145 : 0) : 0;

        double sum = profit * commission;

        System.out.printf(sum == 0 ? "error\n" : "%.2f\n", sum);

    }
}