-53.64% is the change from 660 to 306
Calculation steps:
[( 306 - 660 ) ÷ 660] x 100 = -53.64%
Formula
Percentage change = [(306 - 660) / 660] x 100
Subtract the new number by the original number
306 - 660 = -354
-354 ÷ 660 = -0.5363636363636364
-0.5363636363636364 x 100 = -53.64%