how do you sole this

Question

John wants to buy a DVD player. The price is $100, and the sales tax is 5 percent. Store A is offering a 10 percent discount and Store B is offering a $10 rebate. What would John's total cost be at the two stores?

Answer 1

For Store A, first we find the discount by subtracting 10% of 100 (remember, move the decimal point one space to the left), then add tax-

Store A: 100 - 10 = 90 + 90(0.05) = $94.50

For Store B, we add the sales tax (5% is half of 10%, so 10/2 = 5) then we subtract the rebate (as rebates are typically after you've made a purchase)

Store B: 100 + 5 = 105 - 10 = $95.00