-39.04% is the change from 397 to 242
Calculation steps:
[( 242 - 397 ) ÷ 397] x 100 = -39.04%
Formula
Percentage change = [(242 - 397) / 397] x 100
Subtract the new number by the original number
242 - 397 = -155
-155 ÷ 397 = -0.3904282115869018
-0.3904282115869018 x 100 = -39.04%