A chairs regular price is $349. It is on clearance of 30% off, and a customer uses a 15% off coupon after after that. Final cost of the chair before sales tax ?

For this case we propose a rule of three:

$349 ------------> 100%

x -----------------> 30%

Where the variable "x" represents the 30% discount

So, the price of the chair after the discount is:

$349- $104.7 = $244.3

Now, a customer uses a 15% discount coupon:

$244.3 ---------> 100%

y ------------------> 15%

Where the variable "y" represents the discount amount of 15%.

The final cost of the chair will be:

$244.3- $36,645 = $207,655

$207,655