-42.77% is the change from 830 to 475
Calculation steps:
[( 475 - 830 ) ÷ 830] x 100 = -42.77%
Formula
Percentage change = [(475 - 830) / 830] x 100
Subtract the new number by the original number
475 - 830 = -355
-355 ÷ 830 = -0.42771084337349397
-0.42771084337349397 x 100 = -42.77%