If a 30-day subscription is $499 plus 8% tax, but is being prorated for 7 days, plus there is a $10 off coupon, what's the final cost?

$528.12

Step-by-step explanation:

A cost of  30-day subscription  = $499.00

and Tax rate = 8%

But there is a $10 off coupon.

so the subscription cost would be = 499 - 10 = $489

So the final cost would be = (489 + (8% of 489))

= 489 + (0.08 × 489)

= 489 + 39.12

= $528.12

The final cost would be $528.12