Help please and if you could explain the calculations, that would really help. Thanks and please zoom in if needed.

Castle Inc. has the following information: Month Amount Cost A January $ B0,000 February $112,000 Units 64,000 128,000 Nanth . January February Amount $ 40,000 Cost 3 Units 40,000 80,000 $ 40,000 Month Cost C January February Amount S BO,000 $160,000 Units 160,000 320,000 Indicate whether these costs are variable, fixed, or mixed. Cost A Cost B Cost C