The Andersons went to dinner at the Olive Garden. It their dinner cost $42.95 and they left a 15% tip for their server, how much did they pay altogether?

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Answer 1 · 2017-05-30T15:23:51

See a solution process below:

We can write a formula to solve this problem as:

$p = c + (t * c)$

Where:

$p$ is the total amount paid - what we are solving for in this problem.

$c$ is the cost of the item - $$42.95$ for this problem.

$t$ is the tip percentage - 15% for this problem. "Percent" or "%" means "out of 100" or "per 100", Therefore 15% can be written as $15/100$ .

Substituting and calculating for $p$ gives:

$p = $42.95 + (15/100 * $42.95)$

$p = $42.95 + ($644.25)/100$

$p = $42.95 + $6.44$

$p = $49.39$

The Andersons altogether paid $49.39

Answer 2 · 2017-05-30T15:27:00

$49.39

First, we need to find the tip.
$42.95 xx 15% = 6.4425$

Next, we add the tip to the total.
$42.95 + 6.4425 = 49.3925$

Lastly, we round it off, because who would want to pay a quarter of a cent, right?

$49.3925 ~~ 49.39$

which gives you $49.39.

Alternatively, you could add 100% (the cost of the meal was 100% of 42.95) to the 15% which gives you 115%.

Then you take $115% xx 42.95 = 49.3925$ too. You round it off again to get the same answer of 49.39 (obviously).