-69.5% is the change from 400 to 122
Calculation steps:
[( 122 - 400 ) ÷ 400] x 100 = -69.5%
Formula
Percentage change = [(122 - 400) / 400] x 100
Subtract the new number by the original number
122 - 400 = -278
-278 ÷ 400 = -0.695
-0.695 x 100 = -69.5%