-42.27% is the change from 485 to 280
Calculation steps:
[( 280 - 485 ) ÷ 485] x 100 = -42.27%
Formula
Percentage change = [(280 - 485) / 485] x 100
Subtract the new number by the original number
280 - 485 = -205
-205 ÷ 485 = -0.422680412371134
-0.422680412371134 x 100 = -42.27%