-30.9% is the change from 398 to 275
Calculation steps:
[( 275 - 398 ) ÷ 398] x 100 = -30.9%
Formula
Percentage change = [(275 - 398) / 398] x 100
Subtract the new number by the original number
275 - 398 = -123
-123 ÷ 398 = -0.30904522613065327
-0.30904522613065327 x 100 = -30.9%