A company has inventory of 15 units at a cost of $12 each on August 1. On August 5, they purchased 10 units at $13 per unit. On August 12 they purchased 20 units at $14 per unit. On August 15, they sold 30 units. Using the FIFO periodic inventory method, what is the value of the inventory at August 15 after the sale?
a) $140
b) $160
c) $210
d) $380
e) $590