-4.81% is the change from 270 to 257
Calculation steps:
[( 257 - 270 ) ÷ 270] x 100 = -4.81%
Formula
Percentage change = [(257 - 270) / 270] x 100
Subtract the new number by the original number
257 - 270 = -13
-13 ÷ 270 = -0.04814814814814815
-0.04814814814814815 x 100 = -4.81%