-13.57% is the change from 280 to 242
Calculation steps:
[( 242 - 280 ) ÷ 280] x 100 = -13.57%
Formula
Percentage change = [(242 - 280) / 280] x 100
Subtract the new number by the original number
242 - 280 = -38
-38 ÷ 280 = -0.1357142857142857
-0.1357142857142857 x 100 = -13.57%