Answer :
Okay so heres what you gotta do.
You know that at store a it is $129 for 30%
So that means that you are paying 70%
Use this logic to solve for all of the real prices.
70%=.7
A)129*.7=$90.3
B).65*135=$87.75
C) 150*.6=$90
BUY FROM STORE B SINCE THE PRICE IS THE LOWEST.