A pharmacy purchases five bottles of amoxicillin 250 mg weekly at a total price of $350. If the markup on the cost is 20%, how much does the pharmacy charge per bottle?

To determine the price charged per bottle of amoxicillin, we first need to calculate the total cost of the five bottles purchased. The pharmacy buys five bottles for a total of $350. To find the cost per bottle, we divide the total cost by the number of bottles:

Cost per bottle = Total cost / Number of bottles

Cost per bottle = $350 / 5 = $70

Next, we need to apply the markup to this cost. The pharmacy adds a 20% markup on the cost. To calculate the markup amount, we take 20% of the cost per bottle:

Markup = Cost per bottle * Markup percentage

Markup = $70 * 0.20 = $14

Now, we add this markup to the cost per bottle to find the selling price:

Selling price per bottle = Cost per bottle + Markup

Selling price per bottle = $70 + $14 = $84

Therefore, the pharmacy charges $84 per bottle, which is the correct choice. This calculation process underscores the importance of both understanding how to divide costs and apply percentage markups correctly in a pharmacy setting. By knowing how much to charge after incorporating the markup, the pharmacy can maintain its profitability while providing medications to patients.