-20.28% is the change from 493 to 393
Calculation steps:
[( 393 - 493 ) ÷ 493] x 100 = -20.28%
Formula
Percentage change = [(393 - 493) / 493] x 100
Subtract the new number by the original number
393 - 493 = -100
-100 ÷ 493 = -0.2028397565922921
-0.2028397565922921 x 100 = -20.28%