A cellular phone company charges 17% tax on each bill. Which is a correct way of calculating the bill without tax, if the total bill with tax is known?

A). divide the total bill by 0.83

B). divide the total bill buy 1.17

C). multiply the total bill by 0.83

D). multiply the total bill by 1.17

The correct way of calculating the bill without tax is B. Divide the total bill by 1.17

Step-by-step explanation:

Let's assume that the cellular phone bill with tax for this month is $ 117 (100 + 17 of tax), now let's make the calculation using the four alternatives provided:

A. Divide the total bill by 0.83

117/0.83 = 140.96, therefore it's not the correct way.

B. Divide the total bill by 1.17

117/1.17 = 100, therefore this is the correct way.

C. Multiply the total bill by 0.83

117 * 0.83 = 97.11, therefore this is not the correct way.

D. Multiply the total bill by 1.17

117 * 1.17 = 136.89, therefore this is not the correct way.