-98.25% is the change from 400 to 7
Calculation steps:
[( 7 - 400 ) ÷ 400] x 100 = -98.25%
Formula
Percentage change = [(7 - 400) / 400] x 100
Subtract the new number by the original number
7 - 400 = -393
-393 ÷ 400 = -0.9825
-0.9825 x 100 = -98.25%
Example