Swift: currency converter

//swift
//currency converter

func poundsToBaht(rate:Int, pounds:Int) -> String{
    let baht = rate*pounds
    return "£\(pounds) is \(baht) baht."
}

func bahtToPounds(rate:Int, baht:Int) -> String{
    let pounds = baht/rate
    return "\(baht) baht is £\(pounds)."
}

poundsToBaht(51, 3000)
bahtToPounds(51, 660000)