Beta company displayed the following activity levels and costs for the ye Month Miles January 90,000 February 50,000 March 80,000 Total Cost $ 106,000 100,000 104,000 150,000 April 100,000 Using the high low method, the amount of unit variable costs is Select one: a: 1.75 b. 1.5 c. 1.25 d. 1