279.01% is the change from 81 to 307
Calculation steps:
[( 307 - 81 ) ÷ 81] x 100 = 279.01%
Formula
Percentage change = [(307 - 81) / 81] x 100
Subtract the new number by the original number
307 - 81 = 226
226 ÷ 81 = 2.7901234567901234
2.7901234567901234 x 100 = 279.01%