-79.25% is the change from 400 to 83
Calculation steps:
[( 83 - 400 ) ÷ 400] x 100 = -79.25%
Formula
Percentage change = [(83 - 400) / 400] x 100
Subtract the new number by the original number
83 - 400 = -317
-317 ÷ 400 = -0.7925
-0.7925 x 100 = -79.25%