Question

Estimate a 15% tip on a dinner bill of $52.63 by first rounding the bill amount to the nearest ten dollars.

Answer 1

$52.63 rounded to the nearest ten dollars is $50

10% of $50 is 50/10 = $5

5% of $50 is half of 10% of $50, that is, 5/2 = $2.5

Therefore, 15% of $50 is 5 + 2.5 = $7.5