-63.79% is the change from 660 to 239
Calculation steps:
[( 239 - 660 ) ÷ 660] x 100 = -63.79%
Formula
Percentage change = [(239 - 660) / 660] x 100
Subtract the new number by the original number
239 - 660 = -421
-421 ÷ 660 = -0.6378787878787879
-0.6378787878787879 x 100 = -63.79%