Linear equation

Question

A hotel manager found that his gross receipts for the​ day, including a 5% sales​ tax, were $4186.35

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Find the amount of sales tax collected.

Answer 1

4186.35 = S + (5/100)*S, where S is the sales amount. Now this yields S = 3987. The sales tax collected is 5% of this amount: (5/100) * S = $199.35