79.01% is the change from 81 to 145
Calculation steps:
[( 145 - 81 ) ÷ 81] x 100 = 79.01%
Formula
Percentage change = [(145 - 81) / 81] x 100
Subtract the new number by the original number
145 - 81 = 64
64 ÷ 81 = 0.7901234567901234
0.7901234567901234 x 100 = 79.01%