Given the following cost and activity observations for Smithson Company's utilities, use the high-low method to calculate Smithson's fixed costs per month. Machine Hours Cost January $67,750 10,100 February 109,550 17,700 March 78,020 11,900 April 92,740 14,600 a. $20,700 b. $12,200 c. $9,800 d. $39,000