-7.41% is the change from 270 to 250
Calculation steps:
[( 250 - 270 ) ÷ 270] x 100 = -7.41%
Formula
Percentage change = [(250 - 270) / 270] x 100
Subtract the new number by the original number
250 - 270 = -20
-20 ÷ 270 = -0.07407407407407407
-0.07407407407407407 x 100 = -7.41%