Patrick purchased four new tires that were regularly $94.99 each, but are on sale for $20 off per tire. If sales tax rate is 6%, how much charged to visa card

Question

need equation to solve

Answer 1

Amy:

 

Why do you need an equation, when it is NOT necessary?  But for your sake, I will make one up.

 

Let t be the number of tires Patrick purchased. The sale price per tire is $94.99 - $20.00 = $74.99.  The cost of t tires is (74.99) t dollars. If the sales tax is 6%, that is an additional [(74.99)t](0.06) dollars.  The total to be charged on the Visa card is

 

(74.99) t + [(74.99)t](0.06) = (74.99) (1.06) t dollars.

 

The above is your equation.  If Patrick purchased 4 tires, he substitutes t = 4, and gets

 

(74.99)(1.06)(4) = 317.96 dollars.

 

Amy, there was no need for an equation.  You could have directly multiplied 4 by 74.99, to get the cost before tax and multiplied that number to get cost will tax added.  You will have gotten the same answer.

 

Dr. G.