-35.3% is the change from 660 to 427
Calculation steps:
[( 427 - 660 ) ÷ 660] x 100 = -35.3%
Formula
Percentage change = [(427 - 660) / 660] x 100
Subtract the new number by the original number
427 - 660 = -233
-233 ÷ 660 = -0.353030303030303
-0.353030303030303 x 100 = -35.3%