-41.43% is the change from 939 to 550
Calculation steps:
[( 550 - 939 ) ÷ 939] x 100 = -41.43%
Formula
Percentage change = [(550 - 939) / 939] x 100
Subtract the new number by the original number
550 - 939 = -389
-389 ÷ 939 = -0.4142705005324814
-0.4142705005324814 x 100 = -41.43%