Add BulkDiscount

bulk_discount.rb

@@ -0,0 +1,10 @@
+class BulkDiscount
+  def initialize(unit_discount:, trigger_quantity: 2)
+    @unit_discount = unit_discount
+    @trigger_quantity = trigger_quantity.to_f
+  end
+
+  def discount_for_quantity(quantity)
+    quantity >= @trigger_quantity ? @unit_discount * quantity : 0.00
+  end
+end