-98.57% is the change from 491 to 7
Calculation steps:
[( 7 - 491 ) ÷ 491] x 100 = -98.57%
Formula
Percentage change = [(7 - 491) / 491] x 100
Subtract the new number by the original number
7 - 491 = -484
-484 ÷ 491 = -0.9857433808553971
-0.9857433808553971 x 100 = -98.57%