-3.23% is the change from 930 to 900
Calculation steps:
[( 900 - 930 ) ÷ 930] x 100 = -3.23%
Formula
Percentage change = [(900 - 930) / 930] x 100
Subtract the new number by the original number
900 - 930 = -30
-30 ÷ 930 = -0.03225806451612903
-0.03225806451612903 x 100 = -3.23%