66.33% is the change from 499 to 830
Calculation steps:
[( 830 - 499 ) ÷ 499] x 100 = 66.33%
Formula
Percentage change = [(830 - 499) / 499] x 100
Subtract the new number by the original number
830 - 499 = 331
331 ÷ 499 = 0.6633266533066132
0.6633266533066132 x 100 = 66.33%