// Here's a more idiomatic and concise solution using switch expressions and pattern matching to streamline the SuccessRate method:

​

using System;

​

static class AssemblyLine

{

    private const int CarsPerHourAtSpeed1 = 221;

​

    public static double SuccessRate(int speed) => speed switch

    {

        0 => 0.0,

        <= 4 => 1.0,

        <= 8 => 0.9,

        9 => 0.8,

        10 => 0.77,

        _ => throw new ArgumentOutOfRangeException(nameof(speed), "Speed must be between 0 and 10.")

    };

​

    public static double ProductionRatePerHour(int speed) =>

        speed * CarsPerHourAtSpeed1 * SuccessRate(speed);

​

    public static int WorkingItemsPerMinute(int speed) =>

        (int)(ProductionRatePerHour(speed) / 60);

}

​

/*

Explanation

SuccessRate Method:

​

Uses a switch expression with pattern matching to directly associate speeds with their success rates. This reduces verbosity and improves readability.

The _ case handles out-of-range speeds, throwing an ArgumentOutOfRangeException.

ProductionRatePerHour Method:

​

Uses an expression-bodied member syntax for a concise calculation.

WorkingItemsPerMinute Method:

​

Uses expression-bodied member syntax and casts the division result to int for clarity and conciseness.

*/

​