8.64% is the change from 81 to 88
Calculation steps:
[( 88 - 81 ) ÷ 81] x 100 = 8.64%
Formula
Percentage change = [(88 - 81) / 81] x 100
Subtract the new number by the original number
88 - 81 = 7
7 ÷ 81 = 0.08641975308641975
0.08641975308641975 x 100 = 8.64%