In February, its first month of operations, a retailer made the following inventory purchases. Purchased 350 units at $9 each on Feb. 1. Purchased 250 units for the total cost of $2,325 on Feb. 10. Purchased 100 units at $10 each on Feb. 28. On Feb. 15, there were 400 units sold. The retailer used a perpetual inventory system. Using the weighted average cost formula, the cost of goods sold for the February 15 sale was:

Select one: a. $3,713

b. $3,650

c. $3,829

d. $3,501

e. $3,497