A Company That Manages Apartments Decides to Buy 15 New

A company that manages apartments decides to buy 15 new dishwashers at a list price of $550 each as replacements for old dishwashers in a small apartment complex it owns. Because the company is buying more than 10 dishwashers, it is eligible for a $150-per-unit quantity discount. Financing charges total $20 per unit. The company gets $10 per dishwasher for the 15 dishwashers traded in. What is the final price the company will pay for each dishwasher?

A) $390
B) $400
C) $410
D) $430
E) $730