277.78% is the change from 81 to 306
Calculation steps:
[( 306 - 81 ) ÷ 81] x 100 = 277.78%
Formula
Percentage change = [(306 - 81) / 81] x 100
Subtract the new number by the original number
306 - 81 = 225
225 ÷ 81 = 2.7777777777777777
2.7777777777777777 x 100 = 277.78%