Fractions, Decimals, and Percent - Basic Mathematics for Water and Wastewater Operators - page 104

Solution:
0.66 × 100 = 66%
0.17 × 100 = 17%
0.125 × 100 = 12.5%
1.0 × 100 = 100%
0.05 × 100 = 5%

Problem: Calculate the following (“of” means to multiply; “is” means is equal to):
22% of 110 = ?
17% of 450 = ?
472 is what percentage of 2350?
1.2 is what percentage of 6.3?

Solution:
22% of 110 = 0.22 × 110 = 24.2
17% of 450 = 0.17 × 450 = 76.5
472/2350 = 0.2; 0.2 × 100 = 20%
12

. =× x 63 .

12
63

.
.

== 02 . x

02 100 . ×= 20 %