-89.48% is the change from 485 to 51
Calculation steps:
[( 51 - 485 ) ÷ 485] x 100 = -89.48%
Formula
Percentage change = [(51 - 485) / 485] x 100
Subtract the new number by the original number
51 - 485 = -434
-434 ÷ 485 = -0.8948453608247423
-0.8948453608247423 x 100 = -89.48%