Marvin Company has a beginning inventory of 13 sets of paints at a cost of $1.20 each. During the year, the store purchased 5 sets at $1.30, 7 sets at $1.90, 7 sets at $2.20, and 11 sets at $2.70. By the end of the year, 28 sets were sold.

a. Calculate the number of paint sets in ending inventory.

Number of paint sets           

b. Calculate the cost of ending inventory under LIFO, FIFO, and the weighted average methods.