-79.63% is the change from 491 to 100
Calculation steps:
[( 100 - 491 ) ÷ 491] x 100 = -79.63%
Formula
Percentage change = [(100 - 491) / 491] x 100
Subtract the new number by the original number
100 - 491 = -391
-391 ÷ 491 = -0.7963340122199593
-0.7963340122199593 x 100 = -79.63%