-21.52% is the change from 395 to 310
Calculation steps:
[( 310 - 395 ) ÷ 395] x 100 = -21.52%
Formula
Percentage change = [(310 - 395) / 395] x 100
Subtract the new number by the original number
310 - 395 = -85
-85 ÷ 395 = -0.21518987341772153
-0.21518987341772153 x 100 = -21.52%