-14.29% is the change from 399 to 342
Calculation steps:
[( 342 - 399 ) ÷ 399] x 100 = -14.29%
Formula
Percentage change = [(342 - 399) / 399] x 100
Subtract the new number by the original number
342 - 399 = -57
-57 ÷ 399 = -0.14285714285714285
-0.14285714285714285 x 100 = -14.29%