-29.22% is the change from 438 to 310
Calculation steps:
[( 310 - 438 ) ÷ 438] x 100 = -29.22%
Formula
Percentage change = [(310 - 438) / 438] x 100
Subtract the new number by the original number
310 - 438 = -128
-128 ÷ 438 = -0.2922374429223744
-0.2922374429223744 x 100 = -29.22%