Apple Inc. purchases raw materials for $50,000 on credit terms of 2/10, net 30 from its supplier Samsung Electronics. During the credit period, Apple returns $10,000 worth of defective materials to Samsung Electronics for a credit. Apple Inc. uses the perpetual inventory system.

Calculate the following:

The amount of the purchase discount available if the invoice is paid within the discount period.

The net amount due to Samsung Electronics if the invoice is paid within the discount period.

The net amount due to Samsung Electronics if the invoice is paid after the discount period.

The effective interest rate on the trade credit terms (assume a 360-day year).