Answer
The cost after discount and taxes is $14,032.12.
Work Step by Step
discount=rate*original
$d=0.15\times15321=2298.15$
price=original-discount
$p=15321-2298.15=13022.85$
tax=rate*price
$t=0.0775*13022.85=1009.27$
cost=price+tax
$c=13022.85+1009.27=14032.12$