-87.15% is the change from 397 to 51
Calculation steps:
[( 51 - 397 ) ÷ 397] x 100 = -87.15%
Formula
Percentage change = [(51 - 397) / 397] x 100
Subtract the new number by the original number
51 - 397 = -346
-346 ÷ 397 = -0.871536523929471
-0.871536523929471 x 100 = -87.15%