297.13% is the change from 209 to 830
Calculation steps:
[( 830 - 209 ) ÷ 209] x 100 = 297.13%
Formula
Percentage change = [(830 - 209) / 209] x 100
Subtract the new number by the original number
830 - 209 = 621
621 ÷ 209 = 2.971291866028708
2.971291866028708 x 100 = 297.13%