Castle Inc. has the following information: Month Cost A January February Amount $ 56,000 $112,000 Units 112,000 224,000 Cost B Month January February Amount $ 34,000 $ 34,000 Units 40,000 80,000 Month Cost C January February Amount $ 68,000 $ 95,200 Units 54,400 108,800 Indicate whether these costs are variable, fixed, or mixed Cost A Cost B Cost C