A coffee shop's production function is given by Q = KL, where MPL = K and MPK = L. The barista wage rate is $10 and the rental per square foot is $15. In the short run, store size is fixed at 500 square feet. The short-run average total cost of serving 1,500 cups of coffee is $_____.

a. 2.34
b. 6.03
c. 5.02
d. 0.63