71.24% is the change from 306 to 524
Calculation steps:
[( 524 - 306 ) ÷ 306] x 100 = 71.24%
Formula
Percentage change = [(524 - 306) / 306] x 100
Subtract the new number by the original number
524 - 306 = 218
218 ÷ 306 = 0.7124183006535948
0.7124183006535948 x 100 = 71.24%