M5-7 (Algo) Estimating Cost Behavior (LO 5-2,5-3] Castle Inc. has the following information: Month Cost A January February Amount $ 56,000 $ 78,400 Units 44,800 89,600 Month Cost B January February Amount $ 32,000 $ 64,000 Units 64,000 128,000 Cost C Month January February Amount $ 28,000 $ 28,000 Units 40,000 80,000 Indicate whether these costs are variable, fixed, or mixed. Cost A Cost B Cost C