-80.2% is the change from 490 to 97
Calculation steps:
[( 97 - 490 ) ÷ 490] x 100 = -80.2%
Formula
Percentage change = [(97 - 490) / 490] x 100
Subtract the new number by the original number
97 - 490 = -393
-393 ÷ 490 = -0.8020408163265306
-0.8020408163265306 x 100 = -80.2%