Walden's family is shopping for a reclining chair. The chair the family decided on has a retail price of $800 plus 5% sales tax at four stores. Each store is offering a different promotion. Which store has the best deal?

store A. $75 instant rebate

store B. 10% off sale

store C. 5% off sale plus store pays sale tax

store D. "no tax" sale

Just by looking at the answer you can take out D because C already offers no tax and 5% off, do C is better than D, so we only have to do t math for A, B, and C

A is 800 plus tax, with $75 back

800*1.05 (because it's 5% tax) - 75 = $765

B is 800*.90 (because 10% off means he's paying 90%) *.05=$756

C is 800*.95 (because 5% off means he's paying 95%) = 760

A=765

B=756

C=760

So B is the best deal