-51.02% is the change from 490 to 240
Calculation steps:
[( 240 - 490 ) ÷ 490] x 100 = -51.02%
Formula
Percentage change = [(240 - 490) / 490] x 100
Subtract the new number by the original number
240 - 490 = -250
-250 ÷ 490 = -0.5102040816326531
-0.5102040816326531 x 100 = -51.02%