-90.82% is the change from 490 to 45
Calculation steps:
[( 45 - 490 ) ÷ 490] x 100 = -90.82%
Formula
Percentage change = [(45 - 490) / 490] x 100
Subtract the new number by the original number
45 - 490 = -445
-445 ÷ 490 = -0.9081632653061225
-0.9081632653061225 x 100 = -90.82%