-6% is the change from 250 to 235
Calculation steps:
[( 235 - 250 ) ÷ 250] x 100 = -6%
Formula
Percentage change = [(235 - 250) / 250] x 100
Subtract the new number by the original number
235 - 250 = -15
-15 ÷ 250 = -0.06
-0.06 x 100 = -6%
Example