-6.54% is the change from 306 to 286
Calculation steps:
[( 286 - 306 ) ÷ 306] x 100 = -6.54%
Formula
Percentage change = [(286 - 306) / 306] x 100
Subtract the new number by the original number
286 - 306 = -20
-20 ÷ 306 = -0.06535947712418301
-0.06535947712418301 x 100 = -6.54%