-67.1% is the change from 839 to 276
Calculation steps:
[( 276 - 839 ) ÷ 839] x 100 = -67.1%
Formula
Percentage change = [(276 - 839) / 839] x 100
Subtract the new number by the original number
276 - 839 = -563
-563 ÷ 839 = -0.6710369487485102
-0.6710369487485102 x 100 = -67.1%