-89.86% is the change from 503 to 51
Calculation steps:
[( 51 - 503 ) ÷ 503] x 100 = -89.86%
Formula
Percentage change = [(51 - 503) / 503] x 100
Subtract the new number by the original number
51 - 503 = -452
-452 ÷ 503 = -0.8986083499005965
-0.8986083499005965 x 100 = -89.86%