300.97% is the change from 207 to 830
Calculation steps:
[( 830 - 207 ) ÷ 207] x 100 = 300.97%
Formula
Percentage change = [(830 - 207) / 207] x 100
Subtract the new number by the original number
830 - 207 = 623
623 ÷ 207 = 3.0096618357487923
3.0096618357487923 x 100 = 300.97%