-89.94% is the change from 507 to 51
Calculation steps:
[( 51 - 507 ) ÷ 507] x 100 = -89.94%
Formula
Percentage change = [(51 - 507) / 507] x 100
Subtract the new number by the original number
51 - 507 = -456
-456 ÷ 507 = -0.8994082840236687
-0.8994082840236687 x 100 = -89.94%