-51.75% is the change from 827 to 399
Calculation steps:
[( 399 - 827 ) ÷ 827] x 100 = -51.75%
Formula
Percentage change = [(399 - 827) / 827] x 100
Subtract the new number by the original number
399 - 827 = -428
-428 ÷ 827 = -0.5175332527206772
-0.5175332527206772 x 100 = -51.75%