Thornton Company's cost and production data for two recent months included the following: Required a. Separately calculate the rental cost per unit and the utilities cost per unit for both March and April. b. Identify which cost is variable and which is fixed. Complete this question by entering your answers in the tabs below. Separately calculate the rental cost per unit and the utilities cost per unit for both March and April. (Round your answers to 2 decimal places.) Complete this question by entering your answers in the tabs below. Identify which cost is variable and which is fixed