Question

Yesterday, Nancy's lunch cost $9.80, and she left a $1.47 tip. Today, Nancy's lunch cost $12.60. If she tips at the same rate that she did yesterday, how much of a tip should Nancy leave?

Answer 1

$1.47/ $9.80 = 0.15

15% rate

$12.60 * 15% = $1.89

Explanation:

If her lunch cost $9.80 and she left a $1.47 tip, if we do $1.47/ $9.80 = 0.15. So 15% is our percent of tip.

(That is the cost of the first day and the tip of the second day divided.) If we want to find out how much her next tip should be, we have to multiply the percent of tip (15%) with the next days cost ($12.60.) So, $12.60 * 15%= $1.89

Answer 2

$1.47 = $9.80P
$1.47/$9.80 = $9.80P/$9.80
P = 0.15
The percent of tip is 15%
Today’s Lunch $12.60 x 15% = $12.60 x 0.15 = $1.89
She leaves $1.89 tip.