-89.92% is the change from 506 to 51
Calculation steps:
[( 51 - 506 ) ÷ 506] x 100 = -89.92%
Formula
Percentage change = [(51 - 506) / 506] x 100
Subtract the new number by the original number
51 - 506 = -455
-455 ÷ 506 = -0.8992094861660079
-0.8992094861660079 x 100 = -89.92%