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Selling cell phones

Suppose you are selling phones and want the price of each phone to be $159.00 including a
sales tax of 6%.
(a) Write an equation representing the statement above. 

(b) How much should your pre-tax price be? 
(c) How much would the total cost of a phone be if you had to raise your pre-tax price to $160?
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1 Answer

Total price = Selling price + .06*selling price
$159 = 1.06*selling price
selling price = $150
Tax = $9
c. 160 + 160%.06 = $169.60