86.6% is the change from 306 to 571
Calculation steps:
[( 571 - 306 ) ÷ 306] x 100 = 86.6%
Formula
Percentage change = [(571 - 306) / 306] x 100
Subtract the new number by the original number
571 - 306 = 265
265 ÷ 306 = 0.8660130718954249
0.8660130718954249 x 100 = 86.6%