-89.8% is the change from 490 to 50
Calculation steps:
[( 50 - 490 ) ÷ 490] x 100 = -89.8%
Formula
Percentage change = [(50 - 490) / 490] x 100
Subtract the new number by the original number
50 - 490 = -440
-440 ÷ 490 = -0.8979591836734694
-0.8979591836734694 x 100 = -89.8%