-96.99% is the change from 399 to 12
Calculation steps:
[( 12 - 399 ) ÷ 399] x 100 = -96.99%
Formula
Percentage change = [(12 - 399) / 399] x 100
Subtract the new number by the original number
12 - 399 = -387
-387 ÷ 399 = -0.9699248120300752
-0.9699248120300752 x 100 = -96.99%