-3.08% is the change from 325 to 315
Calculation steps:
[( 315 - 325 ) ÷ 325] x 100 = -3.08%
Formula
Percentage change = [(315 - 325) / 325] x 100
Subtract the new number by the original number
315 - 325 = -10
-10 ÷ 325 = -0.03076923076923077
-0.03076923076923077 x 100 = -3.08%