Santiago was out at a restaurant for dinner when the bill came. His dinner came to $13. After adding in a tip, before tax, he paid $16.64. Find the percent tip.
First, calculate the tip amount:
$16.64 - $13 = $3.64
Next, find the percentage of the tip:
Tip amount / Total bill = Percentage tip
$3.64 / $13 = 0.28
Convert the decimal to a percentage by multiplying by 100:
0.28 x 100 = 28%
Santiago left a 28% tip.