71.9% is the change from 306 to 526
Calculation steps:
[( 526 - 306 ) ÷ 306] x 100 = 71.9%
Formula
Percentage change = [(526 - 306) / 306] x 100
Subtract the new number by the original number
526 - 306 = 220
220 ÷ 306 = 0.7189542483660131
0.7189542483660131 x 100 = 71.9%