-57.11% is the change from 830 to 356
Calculation steps:
[( 356 - 830 ) ÷ 830] x 100 = -57.11%
Formula
Percentage change = [(356 - 830) / 830] x 100
Subtract the new number by the original number
356 - 830 = -474
-474 ÷ 830 = -0.5710843373493976
-0.5710843373493976 x 100 = -57.11%