On April 1, Olympic Company made a sale of $500 on account with terms of 2/10, n/30 to Mendocino, Inc. Mendocino, Inc., returned $100 of product as defective on April 3. On April 9, Mendocino, Inc., paid the amount due, less the cash discount. What was the amount of payment made?
a. $392
b. $408
c. $592
d. $490