11. Fruit Shop

string fruit = Console.ReadLine();
string day = Console.ReadLine();
double quantity = double.Parse(Console.ReadLine());
double sum = 0;

switch (day)
{
    case "Monday":
    case "Tuesday":
    case "Wednesday":
    case "Thursday":
    case "Friday":
        if (fruit == "banana")
        {
            sum = quantity * 2.50;
            Console.WriteLine($"{sum:f2}");
        }

        if (fruit == "apple")
        {
            sum = quantity * 1.20;
            Console.WriteLine($"{sum:f2}");
        }



        if (fruit == "orange")
        {
            sum = quantity * 0.85;
            Console.WriteLine($"{sum:f2}");
        }



        if (fruit == "grapefruit")
        {
            sum = quantity * 1.45;
            Console.WriteLine($"{sum:f2}");
        }

        if (fruit == "kiwi")
        {
            sum = quantity * 2.70;
            Console.WriteLine($"{sum:f2}");
        }

        if (fruit == "pineapple")
        {
            sum = quantity * 5.50;
            Console.WriteLine($"{sum:f2}");

        }

        if (fruit == "grapes")
        {
            sum = quantity * 3.85;
            Console.WriteLine($"{sum:f2}");
        }


        else if (fruit != "banana" && fruit != "apple" && fruit != "orange" && fruit != "grapefruit" && fruit != "kiwi" && fruit != "pineapple" && fruit != "grapes")
        {
            Console.WriteLine("error");
        }

        break;


    case "Saturday":
    case "Sunday":

        if (fruit == "banana")
        {
            sum = quantity * 2.70;
            Console.WriteLine($"{sum:f2}");

        }

        if (fruit == "apple")
        {
            sum = quantity * 1.25;
            Console.WriteLine($"{sum:f2}");
        }

        if (fruit == "orange")
        {
            sum = quantity * 0.90;
            Console.WriteLine($"{sum:f2}");
        }

        if (fruit == "grapefruit")
        {
            sum = quantity * 1.60;
            Console.WriteLine($"{sum:f2}");
        }

        if (fruit == "kiwi")
        {
            sum = quantity * 3.00;
            Console.WriteLine($"{sum:f2}");
        }

        if (fruit == "pineapple")
        {
            sum = quantity * 5.60;
            Console.WriteLine($"{sum:f2}");
        }

        if (fruit == "grapes")
        {
            sum = quantity * 4.20;
            Console.WriteLine($"{sum:f2}");
        }

        else if (fruit != "banana" && fruit != "apple" && fruit != "orange" && fruit != "grapefruit" && fruit != "kiwi" && fruit != "pineapple" && fruit != "grapes")
        {
            Console.WriteLine("error");
        }

        break;



    default:
        {
            Console.WriteLine("error");
        }
        break;
}