-69.1% is the change from 398 to 123
Calculation steps:
[( 123 - 398 ) ÷ 398] x 100 = -69.1%
Formula
Percentage change = [(123 - 398) / 398] x 100
Subtract the new number by the original number
123 - 398 = -275
-275 ÷ 398 = -0.6909547738693468
-0.6909547738693468 x 100 = -69.1%