-10.1% is the change from 287 to 258
Calculation steps:
[( 258 - 287 ) ÷ 287] x 100 = -10.1%
Formula
Percentage change = [(258 - 287) / 287] x 100
Subtract the new number by the original number
258 - 287 = -29
-29 ÷ 287 = -0.10104529616724739
-0.10104529616724739 x 100 = -10.1%