-89.76% is the change from 498 to 51
Calculation steps:
[( 51 - 498 ) ÷ 498] x 100 = -89.76%
Formula
Percentage change = [(51 - 498) / 498] x 100
Subtract the new number by the original number
51 - 498 = -447
-447 ÷ 498 = -0.8975903614457831
-0.8975903614457831 x 100 = -89.76%