Jon’s family wants to purchase a new television set. They are looking at a television set that is normally $879.99 at three different retailers. This week those retailers have the television set on sale. Below are the sales each retailer is advertising: Retailer A
Retailer B
Retailer C
20% off
15% off and take an additional $25 off the sale price
10% off and bring this coupon to receive an additional $100 off at the register.
Part A: Which retailer has the lowest sale price for the television set? Support your answer using words or numbers. (Round your answer to the nearest cent when calculating.)

Part B: Sales tax for all 3 retailers is 8.5%. What is the cost to purchase the cheapest television set? (Round your answer to the nearest cent.)
This is a challenging question.