37.5% is the change from 64 to 88
Calculation steps:
[( 88 - 64 ) ÷ 64] x 100 = 37.5%
Formula
Percentage change = [(88 - 64) / 64] x 100
Subtract the new number by the original number
88 - 64 = 24
24 ÷ 64 = 0.375
0.375 x 100 = 37.5%
Example