-38.12% is the change from 501 to 310
Calculation steps:
[( 310 - 501 ) ÷ 501] x 100 = -38.12%
Formula
Percentage change = [(310 - 501) / 501] x 100
Subtract the new number by the original number
310 - 501 = -191
-191 ÷ 501 = -0.3812375249500998
-0.3812375249500998 x 100 = -38.12%