-99.39% is the change from 490 to 3
Calculation steps:
[( 3 - 490 ) ÷ 490] x 100 = -99.39%
Formula
Percentage change = [(3 - 490) / 490] x 100
Subtract the new number by the original number
3 - 490 = -487
-487 ÷ 490 = -0.9938775510204082
-0.9938775510204082 x 100 = -99.39%