-93.67% is the change from 490 to 31
Calculation steps:
[( 31 - 490 ) ÷ 490] x 100 = -93.67%
Formula
Percentage change = [(31 - 490) / 490] x 100
Subtract the new number by the original number
31 - 490 = -459
-459 ÷ 490 = -0.936734693877551
-0.936734693877551 x 100 = -93.67%