-55.91% is the change from 660 to 291
Calculation steps:
[( 291 - 660 ) ÷ 660] x 100 = -55.91%
Formula
Percentage change = [(291 - 660) / 660] x 100
Subtract the new number by the original number
291 - 660 = -369
-369 ÷ 660 = -0.5590909090909091
-0.5590909090909091 x 100 = -55.91%