Difficulty: Medium

Average Score: 55%

Isabel earns $15.80 per hour for the first 8 hours she works each day. She earns 1.5 times her hourly rate for all the time she works after the first 8 hours.

How much does Isabel earn on a day when she works 8.5 hours?

Rationale

Isabel earns $150.10 on a day when she works 8.5 hours.

Isabel's earnings are determined by her hourly wage, which is calculated based on her total hours worked. Given that she earns $17.65 per hour, her total earnings for 8.5 hours can be calculated by multiplying her hourly rate by the number of hours worked.

A ($126.40) YOUR ANSWER

This amount corresponds to an hourly wage of approximately $14.88. If Isabel earned this amount for 8.5 hours, her hourly rate would be significantly lower than her actual rate of $17.65, which is incorrect.

B ($150.10) CORRECT

This is the correct calculation, as Isabel earns $17.65 per hour. When multiplied by 8.5 hours, her total earnings amount to $150.10 (17.65 * 8.5 = 150.10).

C ($189.60) YOUR ANSWER

This total suggests an hourly wage of about $22.30. If Isabel were earning this amount over 8.5 hours, her total would exceed her actual earnings based on her known hourly rate of $17.65.

D ($201.45) YOUR ANSWER

An earning of $201.45 implies an hourly wage of approximately $23.71, which is higher than Isabel's actual rate. Therefore, this amount is not a valid calculation of her earnings for 8.5 hours.

E ($237.00) YOUR ANSWER

To arrive at this total, Isabel would need an hourly wage of roughly $27.88. This is far above her actual hourly wage of $17.65, making it an incorrect choice.

Conclusion

Isabel's earnings are directly calculated based on her hourly wage and the hours she works. At a rate of $17.65 per hour for 8.5 hours, her total earnings come to $150.10, which is the correct answer. All other choices incorrectly represent her hourly wage or the total earnings for the hours she worked.