Question

A restaurant customer left $3.50 as a tip. The tax on the meal was 7% and the tip was 20% of the cost including tax. A.) What piece of information is not needed to compute the bill after tax and tip? B.) What was the total bill?

Answer 1

A.) value of the tax

B.)The total bill corresponds to $ 17.50

Explanation:

To calculate the value of the meal, the data we do not need to know is the value of the tax because it is included in the total cost of the meal.

We know that the tip corresponds to 20% of the total 100% that we have to find out

To find out we apply a simple rule of three

`20\% \longrightarrow 3.50\\100\% \longrightarrow x \\x= ((100)(3.50))/(20) \\x= 17.5`

The total bill corresponds to $ 17.50

Answer 2

17.50

Explanation:

you really don't need to know the tax amount.

20% of x = 3.50

(20/100) x = 3.50 Divide top and bottom of the left number by 20

(20÷20) / (100÷20) * x = 3.50

(1/5) x = 3.50 Multiply both sides by 5

x = 3.50 * 5

x = 17.50

The meal cost 17.50