-93.92% is the change from 839 to 51
Calculation steps:
[( 51 - 839 ) ÷ 839] x 100 = -93.92%
Formula
Percentage change = [(51 - 839) / 839] x 100
Subtract the new number by the original number
51 - 839 = -788
-788 ÷ 839 = -0.9392133492252682
-0.9392133492252682 x 100 = -93.92%