-86.29% is the change from 620 to 85
Calculation steps:
[( 85 - 620 ) ÷ 620] x 100 = -86.29%
Formula
Percentage change = [(85 - 620) / 620] x 100
Subtract the new number by the original number
85 - 620 = -535
-535 ÷ 620 = -0.8629032258064516
-0.8629032258064516 x 100 = -86.29%