-3.15% is the change from 286 to 277
Calculation steps:
[( 277 - 286 ) ÷ 286] x 100 = -3.15%
Formula
Percentage change = [(277 - 286) / 286] x 100
Subtract the new number by the original number
277 - 286 = -9
-9 ÷ 286 = -0.03146853146853147
-0.03146853146853147 x 100 = -3.15%