To find the price for 1 candy bar, we need to calculate the price per candy bar based on the total cost and the number of candy bars.
We can do this by dividing the total cost by the number of candy bars for any of the provided entries. Let's use one of the entries as an example.
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For 11 candy bars costing $10.89: \[ \text{Price per candy bar} = \frac{$10.89}{11} \approx $0.990 \]
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For 13 candy bars costing $12.87: \[ \text{Price per candy bar} = \frac{$12.87}{13} \approx $0.992 \]
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For 16 candy bars costing $15.84: \[ \text{Price per candy bar} = \frac{$15.84}{16} \approx $0.990 \]
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For 22 candy bars costing $21.78: \[ \text{Price per candy bar} = \frac{$21.78}{22} \approx $0.990 \]
Based on these calculations, the price for 1 candy bar is consistently about $0.99.
So, the cost for 1 candy bar is $0.99.