The following items of a particular commodity were available for sale during the year

Beginning inventory	10 units at $50
First purchase	25 units at $53
Second purchase	30 units at $54
Third purchase	15 units at $60

The firm uses the PERIODIC system and there are 21 units of the commodity on hand at the end of the year. What is the amount of inventory at the end of the year according to the first-in, first-out method(FIFO)?

a.1140

b. 1270

c. 1224

d. 1170