To calculate the total tax Zöe will pay if she orders a book from Store Y, we need to first identify the relevant information:
- The cost of the book: $18.00
- Tax rate: 8%
- Shipping cost: $2.25 (which is not taxable)
Now we calculate the tax on the cost of the book:
\[ \text{Tax} = \text{Cost of Book} \times \text{Tax Rate} \] \[ \text{Tax} = 18.00 \times 0.08 = 1.44 \]
So, if Zöe orders a book from Store Y, she will pay $1.44 in tax.