-39.58% is the change from 662 to 400
Calculation steps:
[( 400 - 662 ) ÷ 662] x 100 = -39.58%
Formula
Percentage change = [(400 - 662) / 662] x 100
Subtract the new number by the original number
400 - 662 = -262
-262 ÷ 662 = -0.3957703927492447
-0.3957703927492447 x 100 = -39.58%