Suppose Toys Forever uses the perpetual inventory system and buys $100,000 of LEGO toys on credit

Question:

Suppose Toys Forever uses the perpetual inventory system and buys $100,000 of LEGO ® toys on credit terms of 3/15, n/45. Some of the goods are damaged in shipment, so Toys Forever returns $12,500 of the merchandise to LEGO ®. How much must Toys Forever pay LEGO®
a. After the discount period?
b. Within the discount period?