29.63% is the change from 81 to 105
Calculation steps:
[( 105 - 81 ) ÷ 81] x 100 = 29.63%
Formula
Percentage change = [(105 - 81) / 81] x 100
Subtract the new number by the original number
105 - 81 = 24
24 ÷ 81 = 0.2962962962962963
0.2962962962962963 x 100 = 29.63%