Final answer:
Nia ended up paying $28.80 for her meal after receiving a 20% birthday discount and tipping 20% on the discounted price.
Step-by-step explanation:
To find out how much Nia ended up paying for her meal, we need to calculate the discounted price after her birthday discount and then calculate the tip based on that price.
First, let's calculate the discount amount. 20% of $30 is $6. Therefore, Nia received a $6 discount on her meal.
The discounted price after her birthday discount is $30 - $6 = $24.
Next, let's calculate the tip amount. 20% of $24 is $4.80.
Finally, let's calculate the total amount Nia paid for her meal. The discounted price of $24 plus the tip of $4.80 is $24 + $4.80 = $28.80.
Therefore, Nia ended up paying $28.80 for her meal.