-39.85% is the change from 660 to 397
Calculation steps:
[( 397 - 660 ) ÷ 660] x 100 = -39.85%
Formula
Percentage change = [(397 - 660) / 660] x 100
Subtract the new number by the original number
397 - 660 = -263
-263 ÷ 660 = -0.3984848484848485
-0.3984848484848485 x 100 = -39.85%