To find out how many burgers Nick's Burgers would sell in a day after a 60% increase, we can follow these steps:
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Calculate the increase in sales: \[ \text{Increase} = \text{Current Sales} \times \text{Percentage Increase} = 140 \times 0.60 = 84 \]
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Add the increase to the current sales: \[ \text{New Sales} = \text{Current Sales} + \text{Increase} = 140 + 84 = 224 \]
Therefore, after a 60% increase, Nick's Burgers would sell 224 burgers in a day.
The correct answer is C. 224.