SOLUTION: I have a $35 dollar gift certificate. I have to pay 8.9% sales tax(based on price of food) and 20% tip(based on price of food). How much can I spend on food if I want to use enti

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Question 171799: I have a $35 dollar gift certificate. I have to pay 8.9% sales tax(based on price of food) and 20% tip(based on price of food). How much can I spend on food if I want to use entire gift certificate
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
lets call x the amount spent of food
:
x+.089x+.2x=35---->1.289x=35---->highlight%28x=27.15%29dollars spent on food.