Question

A restaurant customer left a $ 3. 50 as a tip the tags on the meal with 7% and the tip was 20% of the cost including tax what piece of information is not needed to compute the bill after tax and tip

Answer 1

the 7% tax rate

Explanation:

Since the tip was 20% of the amount including tax, we don't need to know the tax rate to figure the total amount.

_____

The bill before tip was $3.50/0.20 = $17.50, so the total amount including tax and tip was $17.50 +3.50 = $21.00.

(Tax rate doesn't figure in, unless we want to know the bill before tax was added. As it works out, these numbers don't add up. The bill with tax would be either 17.49 or 17.51. It cannot be 17.50.)