The sales tax in one state is 7%. Write a function rule for finding the total cost of an item with selling price x. Then find the total cost of a CD player with a selling price of $150.
a.
f (x) = x - 7; $148.93
c.
f (x) = 7 + x; $151.07
b.
f (x) = 0.07x; $10.50
d.
f (x) = 1.07x; $160.50
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