-97.96% is the change from 491 to 10
Calculation steps:
[( 10 - 491 ) ÷ 491] x 100 = -97.96%
Formula
Percentage change = [(10 - 491) / 491] x 100
Subtract the new number by the original number
10 - 491 = -481
-481 ÷ 491 = -0.9796334012219959
-0.9796334012219959 x 100 = -97.96%