Question

Martinique an antwan had their bill at a restaurant reduced by $6 because of a special discount. They left a tip of $9.80,which was 20% of the reduced amount. How much was their bill before the discount.

Answer 1

$55

Explanation:

Let b represent the original bill. The problem statement tells us ...

20% × (b -6) = 9.80

Dividing by 20% gives ...

b -6 = 49.00

b = 55.00 . . . . . . . add 6

Their bill before the discount was $55.00.

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Comment on the tip

It is generally considered better form to tip on the basis of the original bill before coupons and discounts.