25% is the change from 64 to 80
Calculation steps:
[( 80 - 64 ) ÷ 64] x 100 = 25%
Formula
Percentage change = [(80 - 64) / 64] x 100
Subtract the new number by the original number
80 - 64 = 16
16 ÷ 64 = 0.25
0.25 x 100 = 25%
Example