301.91% is the change from 209 to 840
Calculation steps:
[( 840 - 209 ) ÷ 209] x 100 = 301.91%
Formula
Percentage change = [(840 - 209) / 209] x 100
Subtract the new number by the original number
840 - 209 = 631
631 ÷ 209 = 3.0191387559808613
3.0191387559808613 x 100 = 301.91%