Data commit

Task/Currency/Swift/currency.swift

@@ -0,0 +1,19 @@
+import Foundation
+
+extension Decimal {
+  func rounded(_ scale: Int, _ roundingMode: NSDecimalNumber.RoundingMode) -> Decimal {
+    var result = Decimal()
+    var localCopy = self
+    NSDecimalRound(&result, &localCopy, scale, roundingMode)
+    return result
+  }
+}
+
+let costHamburgers = Decimal(4000000000000000) * Decimal(5.50)
+let costMilkshakes = Decimal(2) * Decimal(2.86)
+let totalBeforeTax = costMilkshakes + costHamburgers
+let taxesToBeCollected = (Decimal(string: "0.0765")! * totalBeforeTax).rounded(2, .bankers)
+
+print("Price before tax: $\(totalBeforeTax)")
+print("Total tax to be collected: $\(taxesToBeCollected)")
+print("Total with taxes: $\(totalBeforeTax + taxesToBeCollected)")