9.45
21 percent is 21% or 21/100.
If 70 is 100 percent, 31.5 is 45 percent.
45% = 0.45 or 9/20
45
60% of 45 = 27
2.00*45/100 = 0.9
45% of 90 is 40.5.
100(21/45) = 47 %, to the justified number of significant digits, like dogs in this sample.
60% of $45= 60% * 45= 0.6 * 45= $27
810
108
45% of 40 = 45% * 40 = 0.45 * 40 = 18