-39.35% is the change from 399 to 242
Calculation steps:
[( 242 - 399 ) ÷ 399] x 100 = -39.35%
Formula
Percentage change = [(242 - 399) / 399] x 100
Subtract the new number by the original number
242 - 399 = -157
-157 ÷ 399 = -0.39348370927318294
-0.39348370927318294 x 100 = -39.35%