-34.7% is the change from 660 to 431
Calculation steps:
[( 431 - 660 ) ÷ 660] x 100 = -34.7%
Formula
Percentage change = [(431 - 660) / 660] x 100
Subtract the new number by the original number
431 - 660 = -229
-229 ÷ 660 = -0.346969696969697
-0.346969696969697 x 100 = -34.7%