Tax Calculator

If the state is "WI", then each order is taxed 5.5%. Otherwise, there is no tax. Write a program to calculate the total price, given the order amount and the state name.

This exercise can be solved with an if statement:

    if state == "WI" {
        const WI_TAX_RATE: f64 = 0.055;
        let tax = WI_TAX_RATE * amount;
        let total = tax + amount;
        println!("The subtotal is ${amount:.2}.");
        println!("The tax is ${tax:.2}.");
        println!("The total is ${total:.2}.");
    } else {
        println!("The total is ${amount:2}.");
    }