39.03% is the change from 597 to 830
Calculation steps:
[( 830 - 597 ) ÷ 597] x 100 = 39.03%
Formula
Percentage change = [(830 - 597) / 597] x 100
Subtract the new number by the original number
830 - 597 = 233
233 ÷ 597 = 0.39028475711892796
0.39028475711892796 x 100 = 39.03%