-86.53% is the change from 490 to 66
Calculation steps:
[( 66 - 490 ) ÷ 490] x 100 = -86.53%
Formula
Percentage change = [(66 - 490) / 490] x 100
Subtract the new number by the original number
66 - 490 = -424
-424 ÷ 490 = -0.8653061224489796
-0.8653061224489796 x 100 = -86.53%