-9.49% is the change from 316 to 286
Calculation steps:
[( 286 - 316 ) ÷ 316] x 100 = -9.49%
Formula
Percentage change = [(286 - 316) / 316] x 100
Subtract the new number by the original number
286 - 316 = -30
-30 ÷ 316 = -0.0949367088607595
-0.0949367088607595 x 100 = -9.49%