-31.11% is the change from 839 to 578
Calculation steps:
[( 578 - 839 ) ÷ 839] x 100 = -31.11%
Formula
Percentage change = [(578 - 839) / 839] x 100
Subtract the new number by the original number
578 - 839 = -261
-261 ÷ 839 = -0.3110846245530393
-0.3110846245530393 x 100 = -31.11%