-84.23% is the change from 501 to 79
Calculation steps:
[( 79 - 501 ) ÷ 501] x 100 = -84.23%
Formula
Percentage change = [(79 - 501) / 501] x 100
Subtract the new number by the original number
79 - 501 = -422
-422 ÷ 501 = -0.8423153692614771
-0.8423153692614771 x 100 = -84.23%