A family of five went out to dinner at HogTastic Pit BBQ. They all ordered the buffet and drink at $12.80 each. They left a 15% gratuity for the waitress on the after-tax bill. Based on a tax rate of 7.5%, they ended up paying a total of $ for dinner.

$79.12

Step-by-step explanation:

Given the following :

Cost per order = $12.80

Number of people = 5

Gratuity left for waitress = 15%

Tax rate = 7.5%

Total bill before tax:

$12.80 * 5 = $64

Bill after tax:

$64 * (1 + 7.5%)

64 - 4.8

= $68.80

Final amount paid:

After tax bill + (after tax bill * Gratuity rate)

$68.80 + (68.80 * 15%)

= $79.12