-97.76% is the change from 491 to 11
Calculation steps:
[( 11 - 491 ) ÷ 491] x 100 = -97.76%
Formula
Percentage change = [(11 - 491) / 491] x 100
Subtract the new number by the original number
11 - 491 = -480
-480 ÷ 491 = -0.9775967413441955
-0.9775967413441955 x 100 = -97.76%