Challenge A: Protocol extension practice

Suppose you own a retail store. You have food items, clothes and electronics. Begin with an Item protocol:

protocol Item {

var name: String { get } var clearance: Bool { get } var msrp: Double { get }

var totalPrice: Double { get }

}

Fulfill the following requirements using primarily what you’ve learned about protocol-oriented programming. In other words, minimize the code in your classes, structs or enums.

• Clothes do not have sales tax, but all other items have 7.5% sales tax.
• When on clearance, food items are discounted 50%, clothes are discounted 25% and electronics are discounted 5%.
• Items should implement CustomStringConvertible and return name. Food items should also print their expiration dates.