Question
Riordan has 8 coins in his wallet. They are either twenty-cent coins or ten-cent coins. What is the biggest possible amount of money in his wallet when he has one or more ten-cent coins? Express your answer in dollars.
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Riordan has 8 coins in his wallet. They are either twenty-cent coins or ten-cent coins. What is the biggest possible amount of money in his wallet when he has one or more ten-cent coins? Express your answer in dollars.