Answer: See explanation
Explanation:
Your question isn't well written but let me help out by making some assumptions.
Let's say Jamie's older brother and his three friends want to split the cost of lunch that costs $30 and they also want to leave a 20% tip. How much should each person pay?
Cost of the lunch = $30
Tip = 20% × $30 = 0.2 × $30 = $6
Total amount to be paid = $30 + $6 = $36
Since there are four people and they want to share the cost, each person would pay:
= $36 / 4
= $9