Answer: The price of Zoe's dinner before sales tax and tips is $13.96.
Step-by-step explanation:
Since we have given that
Amount Zoe paid after sales tax and tip = $18.60
Let the price before tax be 'x'.
Rate of sales tax = 11%
So, it becomes,

So, Amount after tax, our equation, becomes,

Now, let the amount before tips be 'y'.
Rate of tips = 20%
So, it becomes,

So, After tips it becomes,

Hence, The price of Zoe's dinner before sales tax and tips is $13.96.