Answer:
She paid = $33
Explanation:
First we need to find the new price after markup
The original price is 15
100% markup means double the price
New price = original price + original price * mark up rate
=15 + 15 * 1.00
=30
New price is 30
Now we need to find the sales tax, which is the price times the tax rate
sales tax = 30* .10
= 3
The final cost = price + sales tax
= 30 +3
= 33