305.8% is the change from 207 to 840
Calculation steps:
[( 840 - 207 ) ÷ 207] x 100 = 305.8%
Formula
Percentage change = [(840 - 207) / 207] x 100
Subtract the new number by the original number
840 - 207 = 633
633 ÷ 207 = 3.0579710144927534
3.0579710144927534 x 100 = 305.8%