70.08% is the change from 488 to 830
Calculation steps:
[( 830 - 488 ) ÷ 488] x 100 = 70.08%
Formula
Percentage change = [(830 - 488) / 488] x 100
Subtract the new number by the original number
830 - 488 = 342
342 ÷ 488 = 0.7008196721311475
0.7008196721311475 x 100 = 70.08%