-89.68% is the change from 494 to 51
Calculation steps:
[( 51 - 494 ) ÷ 494] x 100 = -89.68%
Formula
Percentage change = [(51 - 494) / 494] x 100
Subtract the new number by the original number
51 - 494 = -443
-443 ÷ 494 = -0.8967611336032388
-0.8967611336032388 x 100 = -89.68%