-35.93% is the change from 501 to 321
Calculation steps:
[( 321 - 501 ) ÷ 501] x 100 = -35.93%
Formula
Percentage change = [(321 - 501) / 501] x 100
Subtract the new number by the original number
321 - 501 = -180
-180 ÷ 501 = -0.3592814371257485
-0.3592814371257485 x 100 = -35.93%