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
Answer:
$207,655