-47.11% is the change from 830 to 439
Calculation steps:
[( 439 - 830 ) ÷ 830] x 100 = -47.11%
Formula
Percentage change = [(439 - 830) / 830] x 100
Subtract the new number by the original number
439 - 830 = -391
-391 ÷ 830 = -0.4710843373493976
-0.4710843373493976 x 100 = -47.11%