Finance—Weekly Sales: The Handi-Neighbor hardware store sells PowerDriver hammers and find...

Finance—Weekly Sales: The Handi-Neighbor hardware store sells PowerDriver hammers and finds that the amount made in dollars for the weekly sales is given by

 f(x) = 9.75x 0 ≤ x ≤ 50

The competing U-Do-It hardware store finds that the weekly sales for selling PowerDriver hammers is

In both functions, x represents the number of PowerDriver hammers sold.

(a) Evaluate ( f − g)(20) and interpret.

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(b) Evaluate ( f + g)(20) and interpret.