Question

the service tip for the waiter is 20%. The total cost of a meal is calculated as c + 0.20c. How much would you have to pay if you have a meal that costs $21.00?

Answer 1

$25.20

Explanation:

Cost of the meal = $21

Total cost

= c + 0.20c

= 21 + 0.20(21)

= $25.20

Answer 2

For this case we have the following function, to calculate the total cost of the meal, including 20% of the tip:

`f (c) = c + 0.20c`

They tell us that a meal costs $ 21.00. That is,
`c = 21`

`f (21) = 21 + 0.20 (21)\\f (21) = 21 + 4.2\\f (21) = 25.2`

Thus, the total cost of the meal is 25.2

Answer:

$ 25.2