-41.45% is the change from 830 to 486
Calculation steps:
[( 486 - 830 ) ÷ 830] x 100 = -41.45%
Formula
Percentage change = [(486 - 830) / 830] x 100
Subtract the new number by the original number
486 - 830 = -344
-344 ÷ 830 = -0.41445783132530123
-0.41445783132530123 x 100 = -41.45%