63.39% is the change from 508 to 830
Calculation steps:
[( 830 - 508 ) ÷ 508] x 100 = 63.39%
Formula
Percentage change = [(830 - 508) / 508] x 100
Subtract the new number by the original number
830 - 508 = 322
322 ÷ 508 = 0.6338582677165354
0.6338582677165354 x 100 = 63.39%