-84.03% is the change from 501 to 80
Calculation steps:
[( 80 - 501 ) ÷ 501] x 100 = -84.03%
Formula
Percentage change = [(80 - 501) / 501] x 100
Subtract the new number by the original number
80 - 501 = -421
-421 ÷ 501 = -0.8403193612774451
-0.8403193612774451 x 100 = -84.03%