-87.12% is the change from 396 to 51
Calculation steps:
[( 51 - 396 ) ÷ 396] x 100 = -87.12%
Formula
Percentage change = [(51 - 396) / 396] x 100
Subtract the new number by the original number
51 - 396 = -345
-345 ÷ 396 = -0.8712121212121212
-0.8712121212121212 x 100 = -87.12%