-66.75% is the change from 839 to 279
Calculation steps:
[( 279 - 839 ) ÷ 839] x 100 = -66.75%
Formula
Percentage change = [(279 - 839) / 839] x 100
Subtract the new number by the original number
279 - 839 = -560
-560 ÷ 839 = -0.6674612634088201
-0.6674612634088201 x 100 = -66.75%