-79.84% is the change from 501 to 101
Calculation steps:
[( 101 - 501 ) ÷ 501] x 100 = -79.84%
Formula
Percentage change = [(101 - 501) / 501] x 100
Subtract the new number by the original number
101 - 501 = -400
-400 ÷ 501 = -0.7984031936127745
-0.7984031936127745 x 100 = -79.84%