Hello, please help me determine the answers for the highlighted boxes in "Ingredient Cost". I'd really appreciate it, please help. Thank you!!

What will be Mark's portion cost for buttercream icing used to frost cupcakes that require 1.25 ounces of buttercream icing per cupcake? Answer: Mark's portion cost for buttercream icing used to frost cupcakes that require 1.25 ounces of buttercream icing per cupcake will be 42.5 cents ($0.34x 1.25=$0.425)