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iOS Swift Enums and Structs Structs What is an Instance?

Convert a Double in a struct to a String

import UIKit

struct Expense {
    var description: String
    var amount: Any


var travel = Expense(description: "Flight to Cupertino", amount: 500.00)

travel.description = "Mile-High Club Reward Miles"
travel.amount = "Priceless"

If it was "var amount: Double" as it was in the original challenge how would I convert it? Could I use ".toString()" ?