911.9% is the change from 84 to 850
Calculation steps:
[( 850 - 84 ) ÷ 84] x 100 = 911.9%
Formula
Percentage change = [(850 - 84) / 84] x 100
Subtract the new number by the original number
850 - 84 = 766
766 ÷ 84 = 9.119047619047619
9.119047619047619 x 100 = 911.9%