-42.17% is the change from 830 to 480
Calculation steps:
[( 480 - 830 ) ÷ 830] x 100 = -42.17%
Formula
Percentage change = [(480 - 830) / 830] x 100
Subtract the new number by the original number
480 - 830 = -350
-350 ÷ 830 = -0.42168674698795183
-0.42168674698795183 x 100 = -42.17%