Solve the problem.A store is discounting all regularly priced items by 30%. (i) Find a function f that computes the sale price of an item having a regular price of x. (ii) Find the regular price of an item that costs $78.46 on sale.
A. f(x) = 0.3 + x; $78.16
B. f(x) = 0.3x; $261.53
C. f(x) = x - 0.3x; $112.09
D. f(x) = x - 0.3; $78.76
Answer: C
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