You bought a cookie for $1.00 and share it with four friends, 1 friend can't eat peanut butter, How much should you pay for your 2 shares of the cookie

Question

You buy a peanut butter cookie for $1.00 and split it to share evenly with four friends, but realize that one of your friends can't eat peanut butter, so you eat both your share and his share. How much should you pay for your 2 shares of the cookie?

I can't figure out how to even start this math problem

Answer 1

Each portion is $0.25. ($1.00 / 4)

So you pay 2 times $0.25.

How much is that?

Answer 2

Well, you end up eating half of it. Your quarter and the quarter that the friend could not eat. So you pay half the cost which is $0.50

The third friend pays you $0.25 and the fourth friend pays you $0.25