-29.03% is the change from 930 to 660
Calculation steps:
[( 660 - 930 ) ÷ 930] x 100 = -29.03%
Formula
Percentage change = [(660 - 930) / 930] x 100
Subtract the new number by the original number
660 - 930 = -270
-270 ÷ 930 = -0.2903225806451613
-0.2903225806451613 x 100 = -29.03%