Final answer:
To find out how much each person contributed to the final bill, calculate the total bill including the tip and sales tax, and then divide it by the number of people. Each person contributed approximately $22.58 to the final bill.
Step-by-step explanation:
To find out how much each person contributed to the final bill, we need to calculate the total bill including the tip and sales tax, and then divide it by the number of people.
First, let's calculate the tip. The bill without the tip is $120. The tip amount is 5.5% of $120, which is 0.055 * $120 = $6.60.
Now, let's calculate the total bill including the tip. The total bill is $120 + $6.60 = $126.60.
Finally, let's calculate the sales tax. The sales tax amount is 7% of $126.60, which is 0.07 * $126.60 = $8.86.
Now, let's calculate how much each person contributed to the final bill. The final bill including the tip and sales tax is $126.60 + $8.86 = $135.46. Since there are 6 people (Mia and her 5 friends), each person contributed $135.46 / 6 = $22.58 (rounded to the nearest cent). Therefore, each person contributed approximately $22.58 to the final bill. So, the correct answer is c) $21.50.