-82.65% is the change from 490 to 85
Calculation steps:
[( 85 - 490 ) ÷ 490] x 100 = -82.65%
Formula
Percentage change = [(85 - 490) / 490] x 100
Subtract the new number by the original number
85 - 490 = -405
-405 ÷ 490 = -0.826530612244898
-0.826530612244898 x 100 = -82.65%