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Castle Inc. has the following information: Month Amount Units Cost A January $ 60,000 120,000 February $120,000 240,000 Month Amount Units Cost B January $ 35, 000 40,000 February $ 35, 006 80,000 Month Amount Units Cost C January $ 70, 090 56,000 February $ 98,000 112,000 Indicate whether these costs are variable, fixed, or mixed. Cost A Cost B Cost C