-29.49% is the change from 936 to 660
Calculation steps:
[( 660 - 936 ) ÷ 936] x 100 = -29.49%
Formula
Percentage change = [(660 - 936) / 936] x 100
Subtract the new number by the original number
660 - 936 = -276
-276 ÷ 936 = -0.2948717948717949
-0.2948717948717949 x 100 = -29.49%