-87.49% is the change from 839 to 105
Calculation steps:
[( 105 - 839 ) ÷ 839] x 100 = -87.49%
Formula
Percentage change = [(105 - 839) / 839] x 100
Subtract the new number by the original number
105 - 839 = -734
-734 ÷ 839 = -0.8748510131108462
-0.8748510131108462 x 100 = -87.49%