Marvin Company has a beginning inventory of 12 sets of paints at a cost of $1.60 each. During the year, the store purchased 4 sets at $1.70, 6 sets at $2.30, 6 sets at $2.60, and 10 sets at $3.10. By the end of the year, 25 sets were sold.
a. Calculate the number of paint sets in ending inventory.