-89.63% is the change from 492 to 51
Calculation steps:
[( 51 - 492 ) ÷ 492] x 100 = -89.63%
Formula
Percentage change = [(51 - 492) / 492] x 100
Subtract the new number by the original number
51 - 492 = -441
-441 ÷ 492 = -0.8963414634146342
-0.8963414634146342 x 100 = -89.63%