-86.25% is the change from 400 to 55
Calculation steps:
[( 55 - 400 ) ÷ 400] x 100 = -86.25%
Formula
Percentage change = [(55 - 400) / 400] x 100
Subtract the new number by the original number
55 - 400 = -345
-345 ÷ 400 = -0.8625
-0.8625 x 100 = -86.25%