-83.67% is the change from 490 to 80
Calculation steps:
[( 80 - 490 ) ÷ 490] x 100 = -83.67%
Formula
Percentage change = [(80 - 490) / 490] x 100
Subtract the new number by the original number
80 - 490 = -410
-410 ÷ 490 = -0.8367346938775511
-0.8367346938775511 x 100 = -83.67%