A sports store sells each dark chocolate for $6$ dollars, each milk chocolate for $5$ dollars, and each stawberry chocolate for $4$ dollars. In this year\textquotesingle s winter sale, the bar decides to make a blended these chocolates by mixing up $20$ dark chocolates, $20$ milk chocolates, and $20$ stawberry chocolates. How much will a blended chocolate cost on average? 
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