-40.6% is the change from 830 to 493
Calculation steps:
[( 493 - 830 ) ÷ 830] x 100 = -40.6%
Formula
Percentage change = [(493 - 830) / 830] x 100
Subtract the new number by the original number
493 - 830 = -337
-337 ÷ 830 = -0.40602409638554215
-0.40602409638554215 x 100 = -40.6%