51.56% is the change from 64 to 97
Calculation steps:
[( 97 - 64 ) ÷ 64] x 100 = 51.56%
Formula
Percentage change = [(97 - 64) / 64] x 100
Subtract the new number by the original number
97 - 64 = 33
33 ÷ 64 = 0.515625
0.515625 x 100 = 51.56%
Example