To find the price of one candy bar, we can divide the total cost by the number of candy bars for each entry:
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For 10 candy bars: \[ \text{Price per candy bar} = \frac{8.0}{10} = 0.80 \]
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For 12 candy bars: \[ \text{Price per candy bar} = \frac{9.6}{12} = 0.80 \]
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For 15 candy bars: \[ \text{Price per candy bar} = \frac{12.0}{15} = 0.80 \]
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For 21 candy bars: \[ \text{Price per candy bar} = \frac{16.8}{21} = 0.80 \]
In all cases, the price for one candy bar is consistently $0.80.
Thus, the cost for 1 candy bar is $0.80.