-29.79% is the change from 940 to 660
Calculation steps:
[( 660 - 940 ) ÷ 940] x 100 = -29.79%
Formula
Percentage change = [(660 - 940) / 940] x 100
Subtract the new number by the original number
660 - 940 = -280
-280 ÷ 940 = -0.2978723404255319
-0.2978723404255319 x 100 = -29.79%