You pirchase goods with list price of $500. you return goods that are defective, having a list price of $30. you are entitled to trade discount of 25%. the seller is paid $20 in Freight on your behalf

You pirchase goods with list price of $500. you return goods that are defective, having a list price of $30. you are entitled to trade discount of 25%. the seller is paid $20 in Freight on your behalf and added the amount to the invoice. you are offered a 4% cash discount if you pay the invoice within 15 days. What is the net amount you should pay the supplier if you pay within the discount period?