Estimate a 15% tip on a dinner bill of $73.55 by first rounding the bill amount to the nearest ten dollars.

round 73.55 to 70.00 add 15%(10.50) = 80.50

Step-by-step explanation:

round 73.55 to 70.00 add 15%(10.50) = 80.50

.632

step-by-step explanation:

6 * 1/10 = 3/5

3*0.01 = 0.03

3/5 + 0.03 = .63

2*0.002 = .002

.63 + 0.002 = .632

it would rotate about 180 degrees.