170.36% is the change from 307 to 830
Calculation steps:
[( 830 - 307 ) ÷ 307] x 100 = 170.36%
Formula
Percentage change = [(830 - 307) / 307] x 100
Subtract the new number by the original number
830 - 307 = 523
523 ÷ 307 = 1.703583061889251
1.703583061889251 x 100 = 170.36%