69.16% is the change from 308 to 521
Calculation steps:
[( 521 - 308 ) ÷ 308] x 100 = 69.16%
Formula
Percentage change = [(521 - 308) / 308] x 100
Subtract the new number by the original number
521 - 308 = 213
213 ÷ 308 = 0.6915584415584416
0.6915584415584416 x 100 = 69.16%