-62.89% is the change from 830 to 308
Calculation steps:
[( 308 - 830 ) ÷ 830] x 100 = -62.89%
Formula
Percentage change = [(308 - 830) / 830] x 100
Subtract the new number by the original number
308 - 830 = -522
-522 ÷ 830 = -0.6289156626506024
-0.6289156626506024 x 100 = -62.89%