307.77% is the change from 206 to 840
Calculation steps:
[( 840 - 206 ) ÷ 206] x 100 = 307.77%
Formula
Percentage change = [(840 - 206) / 206] x 100
Subtract the new number by the original number
840 - 206 = 634
634 ÷ 206 = 3.0776699029126213
3.0776699029126213 x 100 = 307.77%