-40.86% is the change from 930 to 550
Calculation steps:
[( 550 - 930 ) ÷ 930] x 100 = -40.86%
Formula
Percentage change = [(550 - 930) / 930] x 100
Subtract the new number by the original number
550 - 930 = -380
-380 ÷ 930 = -0.40860215053763443
-0.40860215053763443 x 100 = -40.86%