62.75% is the change from 510 to 830
Calculation steps:
[( 830 - 510 ) ÷ 510] x 100 = 62.75%
Formula
Percentage change = [(830 - 510) / 510] x 100
Subtract the new number by the original number
830 - 510 = 320
320 ÷ 510 = 0.6274509803921569
0.6274509803921569 x 100 = 62.75%