63.96% is the change from 308 to 505
Calculation steps:
[( 505 - 308 ) ÷ 308] x 100 = 63.96%
Formula
Percentage change = [(505 - 308) / 308] x 100
Subtract the new number by the original number
505 - 308 = 197
197 ÷ 308 = 0.6396103896103896
0.6396103896103896 x 100 = 63.96%