Please help explain #60

Cardinal Cleaners Cardinal Cleaners documented the gallons of cleaning solvent it used as well as total overhead costs for the past five months as follows: Number of gallons 160 150 155 175 170 Total overhead costs 6,500 6,100 6,700 7,000 6,800 July August October November 58. Refer to the Cardinal Cleaners information above. Using the high/low method, what is the variable cost per unit? a. $25.00 b. $0.03 c. $900.00 d. $36.00 59. Refer to the Cardinal Cleaners information above. Using the high/low method, what is equation to predict total overhead costs? a. Y- $700 +$36x b. Y-$900+ $25x d. Y- $100+$40x 60. Refer to the Cardinal Cleaners information above. Cardinal uses the highlow method to predict total overhead costs. If Cardinal anticipates using 162 gallons of solvent in December, what are expected total overhead costs? a. $6,500 b. $6,532 c. $5,832 d. $700