To calculate the earnings for the grocery store employee who works 55 hours in a week:
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Regular Pay: The employee earns $15 an hour for the first 40 hours.
- Regular pay = $15/hour * 40 hours = $600
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Overtime Pay: The employee earns $20 an hour for each hour over 40. Since he worked 55 hours, the number of overtime hours is:
- Overtime hours = 55 hours - 40 hours = 15 hours
- Overtime pay = $20/hour * 15 hours = $300
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Total Pay: Now, add the regular pay and the overtime pay:
- Total pay = Regular pay + Overtime pay = $600 + $300 = $900
Thus, if the employee works 55 hours, he will make $900 for the week.
The correct answer is $900.