Question

Kallie’s mom takes her out for lunch. The bill comes to $18.75. Her mom comments that the waiter did a good job and deserves a 15% tip. Kallie notices that her mom leaves a $4 tip. Explain how Kallie can mentally estimate whether her mom’s tip is reasonable for a 15% tip.

Answer 1

Find 10% by moving the decimal point one place to the left, so 10% of 18.75 would be 1.875 then half of that would be 5%

15% would be about 1.88 + 0.94 = 2.82

The tip was really a little over 15% so you can say it is reasonable.