Andrea is shopping for items for her pet sitting business because the store is having a sale where everything in the store is 5% off. andrea buys a cat carrier for $39.99 and a cat tower for $19.99. she has a coupon for an additional 15% off on the cat tower. before tax, andrea estimates that her total, after discounts, will be about $54. determine if andrea has estimated correctly. a. yes. andrea has estimated correctly. b. no. andrea has taken 20% of the total, which is not correct.. c. no. andrea has taken successive discounts on the total, but the coupon is just on the cat tower. d. no. andrea has only taken the 5% discount on the cat tower and not on the carrier