69.73% is the change from 489 to 830
Calculation steps:
[( 830 - 489 ) ÷ 489] x 100 = 69.73%
Formula
Percentage change = [(830 - 489) / 489] x 100
Subtract the new number by the original number
830 - 489 = 341
341 ÷ 489 = 0.6973415132924335
0.6973415132924335 x 100 = 69.73%