315% is the change from 200 to 830
Calculation steps:
[( 830 - 200 ) ÷ 200] x 100 = 315%
Formula
Percentage change = [(830 - 200) / 200] x 100
Subtract the new number by the original number
830 - 200 = 630
630 ÷ 200 = 3.15
3.15 x 100 = 315%
Example