255.81% is the change from 86 to 306
Calculation steps:
[( 306 - 86 ) ÷ 86] x 100 = 255.81%
Formula
Percentage change = [(306 - 86) / 86] x 100
Subtract the new number by the original number
306 - 86 = 220
220 ÷ 86 = 2.558139534883721
2.558139534883721 x 100 = 255.81%