You bought a sandwich for 12.40 it includes the tax 5% what is the cost of the sandwich before tax?

Answer: $11.81✔️cost of the sandwich before tax

Step-by-step explanation:

Let C = cost before tax

Cell phone costs = C + C·5% = $12.40

C (1 + 0.05) = $12.40

C = $12.40/1.05 = $11.81, cost before tax

Answer: $11.81✔️ cost of the sandwich before tax

Checking

Cell phone after tax = $11.81 + $11.81·5/100

Cell phone after tax = $11.81 + $0.59 = $12.40✔️checked!

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