290.48% is the change from 210 to 820
Calculation steps:
[( 820 - 210 ) ÷ 210] x 100 = 290.48%
Formula
Percentage change = [(820 - 210) / 210] x 100
Subtract the new number by the original number
820 - 210 = 610
610 ÷ 210 = 2.9047619047619047
2.9047619047619047 x 100 = 290.48%