-49.9% is the change from 978 to 490
Calculation steps:
[( 490 - 978 ) ÷ 978] x 100 = -49.9%
Formula
Percentage change = [(490 - 978) / 978] x 100
Subtract the new number by the original number
490 - 978 = -488
-488 ÷ 978 = -0.49897750511247446
-0.49897750511247446 x 100 = -49.9%