-87.94% is the change from 423 to 51
Calculation steps:
[( 51 - 423 ) ÷ 423] x 100 = -87.94%
Formula
Percentage change = [(51 - 423) / 423] x 100
Subtract the new number by the original number
51 - 423 = -372
-372 ÷ 423 = -0.8794326241134752
-0.8794326241134752 x 100 = -87.94%