Answer: To calculate the final price that Lin's father pays for the meal, we need to apply the discount first and then add the sales tax.
Discount = 18% of $23.89
= 0.18 x $23.89
= $4.30
The discounted price of the meal is therefore:
$23.89 - $4.30 = $19.59
Next, we need to add the sales tax of 7%:
Sales Tax = 7% of $19.59
= 0.07 x $19.59
= $1.37
Therefore, the final price that Lin's father pays for the meal is:
$19.59 + $1.37 = $20.96
So, Lin's father pays $20.96 for the meal after applying the discount and sales tax.
Explanation: