840% is the change from 85 to 799
Calculation steps:
[( 799 - 85 ) ÷ 85] x 100 = 840%
Formula
Percentage change = [(799 - 85) / 85] x 100
Subtract the new number by the original number
799 - 85 = 714
714 ÷ 85 = 8.4
8.4 x 100 = 840%
Example