-2.44% is the change from 287 to 280
Calculation steps:
[( 280 - 287 ) ÷ 287] x 100 = -2.44%
Formula
Percentage change = [(280 - 287) / 287] x 100
Subtract the new number by the original number
280 - 287 = -7
-7 ÷ 287 = -0.024390243902439025
-0.024390243902439025 x 100 = -2.44%