Final answer:
The retail price for the antibiotic after an 18% markup on the original price of $36.75 is $43.37.
Step-by-step explanation:
The student is asking about calculating the retail price of a medication after applying a certain percentage of markup. To find the retail price, one needs to calculate the markup in dollars and then add this to the original cost.
To calculate the markup amount: 18% of $36.75.
Markup = 0.18 × $36.75 = $6.615 (which can be rounded to $6.62 for currency).
Now, add the markup to the original cost to get the retail price:
Retail price = Original cost + Markup = $36.75 + $6.62 = $43.37.
Therefore, the correct answer is: b. $43.37.