260.87% is the change from 230 to 830
Calculation steps:
[( 830 - 230 ) ÷ 230] x 100 = 260.87%
Formula
Percentage change = [(830 - 230) / 230] x 100
Subtract the new number by the original number
830 - 230 = 600
600 ÷ 230 = 2.608695652173913
2.608695652173913 x 100 = 260.87%