-14% is the change from 250 to 215
Calculation steps:
[( 215 - 250 ) ÷ 250] x 100 = -14%
Formula
Percentage change = [(215 - 250) / 250] x 100
Subtract the new number by the original number
215 - 250 = -35
-35 ÷ 250 = -0.14
-0.14 x 100 = -14%
Example