-96.94% is the change from 490 to 15
Calculation steps:
[( 15 - 490 ) ÷ 490] x 100 = -96.94%
Formula
Percentage change = [(15 - 490) / 490] x 100
Subtract the new number by the original number
15 - 490 = -475
-475 ÷ 490 = -0.9693877551020408
-0.9693877551020408 x 100 = -96.94%