Final answer:
The weekly deduction for medical insurance is approximately $55.87.
Step-by-step explanation:
To determine how much is deducted each week for medical insurance, we need to find 90% of the annual cost of insurance and divide it by the number of weeks in a year.
Given that the annual cost of insurance is $3,228, 90% of this amount is $2,905.20.
Dividing $2,905.20 by 52 (the number of weeks in a year) gives us a weekly deduction of approximately $55.87.
Therefore, the correct answer is option b. $55.87.