vinay911 wrote:

Grocery store's profit equals sales minus the cost and taxes. By what percent did the grocery store's profit changed on July 25,2005 When sales, cost, and taxes all increased?

(1) Grocery store's sales increased by 5 percent on july 25,2005.

(2) Grocery store's cost and taxes increased by 25 percent on July 25,2005.

P - profit

S - sales

C - cost

T - taxes

So, P = S - (C + T)

(1) & (2) obviously neither one sufficient alone

(1) and (2) together:

\(\frac{P_{new}}{P_{old}}=\frac{1.05S-1.25(C+T)}{S-(C+T)},\) again not sufficient.

Answer E

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