-3.2% is the change from 250 to 242
Calculation steps:
[( 242 - 250 ) ÷ 250] x 100 = -3.2%
Formula
Percentage change = [(242 - 250) / 250] x 100
Subtract the new number by the original number
242 - 250 = -8
-8 ÷ 250 = -0.032
-0.032 x 100 = -3.2%
Example