What price would I want to sell my 12 posters to my 12 friends if my first frien

Question

What price would I want to sell my 12 posters to my 12 friends if my first friend will buy it for $11 dollars, my second at $10 dollars, and so on until that 12th friend would get the poster for $0 dollars? (The price has to be the same for all 12 friends) What price would I want to sell my 12 posters to my 12 friends if my first friend will buy it for $11 dollars, my second at $10 dollars, and so on until that 12th friend would get the poster for $0 dollars? (The price has to be the same for all 12 friends)

Explanation / Answer

price for each friend = (11 + 10 + 9 +8 + 7 + 6 + 5 + 4 + 3 + 2 + 1)/12

= 5.5

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