The Alvarado family went out for supper last week. The meal cost $65.92. .
The sales tax is 7% of the meal.
The tip was 20% of the meal.
There are 4 people in the family.
What was the cost per person for the meal, including sales tax and tip?
A. $84.64
B. $21.16
C. $14.11
D. $16.48

The correct answer is $21.16

Explanation:

The first step to solve this mathematical problem and find the correct answer is to calculate the cost of the sales tax and the tip by using the cost of the meal. The process is shown below:

1. Calculate the sales tax (7%)

7% of $65.92

65.92 / 100 = 0.6592

0.6592 x 7 = 4.6144 (Money on the sales tax)

2. Now, add the initial cost of the meal to the taxes and calculate the tip (20%)

$65.92 + $4.6144 = $70.5344

20% of $70.5344

70.5344 / 100 = 0.705344

0.705344 x 20 = 14.10688 (Money on tip)

Now, let's add the three values to calculate the total cost of the meal

$65.92 + $4.6144 + $14.10688 = $84.64128

Finally, divide the price into 4 because 4 people will pay

$84.64128 / 4 = $21.16032 which can be simplified as $21.16