Rent cost and utility cost are fixed or variable?

Stuart Company's cost and production data for two recent months included the following: March April Production (units) 600 900 Rent $1, 800 $1, 800 Utilities $ 600 900 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. Required A Required B Identify which cost is variable and which is fixed. Rent cost Utility cost Fixed cost Variable cost