-9.72% is the change from 319 to 288
Calculation steps:
[( 288 - 319 ) ÷ 319] x 100 = -9.72%
Formula
Percentage change = [(288 - 319) / 319] x 100
Subtract the new number by the original number
288 - 319 = -31
-31 ÷ 319 = -0.09717868338557993
-0.09717868338557993 x 100 = -9.72%