-83% is the change from 400 to 68
Calculation steps:
[( 68 - 400 ) ÷ 400] x 100 = -83%
Formula
Percentage change = [(68 - 400) / 400] x 100
Subtract the new number by the original number
68 - 400 = -332
-332 ÷ 400 = -0.83
-0.83 x 100 = -83%
Example