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  3. you pay 5 to play a game where if you...

Question: you pay 5 to play a game where if you...

Question details

You pay $5 to play a game where if you roll doubles you win $20 and if you don't roll doubles you win nothing.  This means that if you win you earn $15 and if you loose, you earn negative $5.

 What are your expected earnings each time you play?  

Leave your answer as only a decimal number with 2 decimal places precision (for example 2.45). Do not include a dollar sign. 

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