-42.86% is the change from 490 to 280
Calculation steps:
[( 280 - 490 ) ÷ 490] x 100 = -42.86%
Formula
Percentage change = [(280 - 490) / 490] x 100
Subtract the new number by the original number
280 - 490 = -210
-210 ÷ 490 = -0.42857142857142855
-0.42857142857142855 x 100 = -42.86%