-66.15% is the change from 839 to 284
Calculation steps:
[( 284 - 839 ) ÷ 839] x 100 = -66.15%
Formula
Percentage change = [(284 - 839) / 839] x 100
Subtract the new number by the original number
284 - 839 = -555
-555 ÷ 839 = -0.6615017878426699
-0.6615017878426699 x 100 = -66.15%