*confused* Mrs. Blush is purchasing a new car. The salesperson has offered her $3000 for a trade in on her old car. The price of the new car is $15,600. When the salesperson determined what she would pay for the car, Mrs. Blush noticed she had calculated the 8% sales tax on the car before subtracting the trade in value. Mrs. Blush insisted she subtract the trade in value before calculating the salestax. The salesperson agreed. Determine how much Mrs. Blush saved from this negotiation?

Question

anonymous · Answer

So the first time she pays this:

C = (15600*.08)+15600 - 3000
And after doing it the other way you do this:
C = (15600-3000)+.08*(15600-3000)

anonymous · Answer

Find the difference between the two prices.

mathstudent55 · Answer

Mrs. Blush should pay:
$15,600 - $3,000 = $12,600
8% tax on $12,600 is $1008

Without crediting the trade-in:
Mrs. Blush would pay
8% tax on $15,600 is $1258

The difference is $1258 - $1008