-17.75% is the change from 400 to 329
Calculation steps:
[( 329 - 400 ) ÷ 400] x 100 = -17.75%
Formula
Percentage change = [(329 - 400) / 400] x 100
Subtract the new number by the original number
329 - 400 = -71
-71 ÷ 400 = -0.1775
-0.1775 x 100 = -17.75%