The following lots of a particu lar commodity were available for sale during the year: Beginning inventory-10 units at $60 First purchase - 25 units at $63 Second purchase - 30 units at $64 64x5+70x15 Jr Third purchase 15 units at $70 The firm uses the periodic system and there are 20 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? A. $1,200 B. $1,230 C. $1,370 D. $1,400