-83.91% is the change from 491 to 79
Calculation steps:
[( 79 - 491 ) ÷ 491] x 100 = -83.91%
Formula
Percentage change = [(79 - 491) / 491] x 100
Subtract the new number by the original number
79 - 491 = -412
-412 ÷ 491 = -0.8391038696537678
-0.8391038696537678 x 100 = -83.91%