-39.72% is the change from 287 to 173
Calculation steps:
[( 173 - 287 ) ÷ 287] x 100 = -39.72%
Formula
Percentage change = [(173 - 287) / 287] x 100
Subtract the new number by the original number
173 - 287 = -114
-114 ÷ 287 = -0.397212543554007
-0.397212543554007 x 100 = -39.72%