39.06% is the change from 64 to 89
Calculation steps:
[( 89 - 64 ) ÷ 64] x 100 = 39.06%
Formula
Percentage change = [(89 - 64) / 64] x 100
Subtract the new number by the original number
89 - 64 = 25
25 ÷ 64 = 0.390625
0.390625 x 100 = 39.06%
Example