Final answer:
To estimate the amount each person should contribute for the tip, divide the total tip by the number of people.
Step-by-step explanation:
To estimate how much each person should contribute for the tip, we need to first calculate the tip amount. Since they decided to leave a 20% tip, we can find the tip by multiplying the total bill ($175.42) by 0.20:
Tip = $175.42 * 0.20 = $35.08
Now, to find how much each person should contribute, we divide the total tip amount by the number of people, which is 11 (Mr. Clark and his 10 friends):
Each person's contribution = $35.08 / 11 = $3.19
Therefore, each person should contribute approximately $3.19 towards the tip.