-39.8% is the change from 819 to 493
Calculation steps:
[( 493 - 819 ) ÷ 819] x 100 = -39.8%
Formula
Percentage change = [(493 - 819) / 819] x 100
Subtract the new number by the original number
493 - 819 = -326
-326 ÷ 819 = -0.398046398046398
-0.398046398046398 x 100 = -39.8%