-8.39% is the change from 310 to 284
Calculation steps:
[( 284 - 310 ) ÷ 310] x 100 = -8.39%
Formula
Percentage change = [(284 - 310) / 310] x 100
Subtract the new number by the original number
284 - 310 = -26
-26 ÷ 310 = -0.08387096774193549
-0.08387096774193549 x 100 = -8.39%