-81.24% is the change from 485 to 91
Calculation steps:
[( 91 - 485 ) ÷ 485] x 100 = -81.24%
Formula
Percentage change = [(91 - 485) / 485] x 100
Subtract the new number by the original number
91 - 485 = -394
-394 ÷ 485 = -0.8123711340206186
-0.8123711340206186 x 100 = -81.24%