-42.28% is the change from 939 to 542
Calculation steps:
[( 542 - 939 ) ÷ 939] x 100 = -42.28%
Formula
Percentage change = [(542 - 939) / 939] x 100
Subtract the new number by the original number
542 - 939 = -397
-397 ÷ 939 = -0.422790202342918
-0.422790202342918 x 100 = -42.28%