Answer: The price of billing is $221.40.
Explanation:
Since we have given that
Amount Zoe has paid in sales tax = $18.60
Rate of sales tax = 11%
So, Let the original price be 'x'.
According to question, it becomes,

Rate of tip = 20%
Amount of tip is given by

Amount after tip is given by

Hence, The price of billing is given by
