-28.82% is the change from 399 to 284
Calculation steps:
[( 284 - 399 ) ÷ 399] x 100 = -28.82%
Formula
Percentage change = [(284 - 399) / 399] x 100
Subtract the new number by the original number
284 - 399 = -115
-115 ÷ 399 = -0.2882205513784461
-0.2882205513784461 x 100 = -28.82%