-70.2% is the change from 839 to 250
Calculation steps:
[( 250 - 839 ) ÷ 839] x 100 = -70.2%
Formula
Percentage change = [(250 - 839) / 839] x 100
Subtract the new number by the original number
250 - 839 = -589
-589 ÷ 839 = -0.7020262216924911
-0.7020262216924911 x 100 = -70.2%