-95.92% is the change from 490 to 20
Calculation steps:
[( 20 - 490 ) ÷ 490] x 100 = -95.92%
Formula
Percentage change = [(20 - 490) / 490] x 100
Subtract the new number by the original number
20 - 490 = -470
-470 ÷ 490 = -0.9591836734693877
-0.9591836734693877 x 100 = -95.92%