Final answer:
The amount of money withheld from the medical assistant's gross earnings for a one-week period is $61.00.
Step-by-step explanation:
To calculate the amount of money withheld from the medical assistant's gross earnings for a one-week period, we need to first calculate the gross earnings. The medical assistant earns $15.00 per hour and works 40 hours, so the gross earnings would be $15.00 x 40 = $600.00.
Next, we need to calculate the amount of money withheld for FICA taxes. FICA taxes are withheld at a rate of 7.65 percent. To calculate this, we multiply the gross earnings by 7.65 percent:
$600.00 x 0.0765 = $45.90
Therefore, the correct answer is option b) $61.00.