29.69% is the change from 64 to 83
Calculation steps:
[( 83 - 64 ) ÷ 64] x 100 = 29.69%
Formula
Percentage change = [(83 - 64) / 64] x 100
Subtract the new number by the original number
83 - 64 = 19
19 ÷ 64 = 0.296875
0.296875 x 100 = 29.69%
Example