To figure out how many more chocolate bars Dennis needs to sell in order to win a prize, we first need to determine how much more money he needs to make beyond the $175 threshold.
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Calculate how much more money he needs: \[ 175 - 40 = 135 \]
Dennis needs to sell an additional $135 worth of chocolate bars.
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Each chocolate bar sells for $2.50. To find out how many more bars he needs to sell, we divide the amount he needs by the price of each bar: \[ \frac{135}{2.50} = 54 \]
So, Dennis needs to sell 54 more chocolate bars to win the prize.