-20.61% is the change from 427 to 339
Calculation steps:
[( 339 - 427 ) ÷ 427] x 100 = -20.61%
Formula
Percentage change = [(339 - 427) / 427] x 100
Subtract the new number by the original number
339 - 427 = -88
-88 ÷ 427 = -0.20608899297423888
-0.20608899297423888 x 100 = -20.61%