A pharmacist adds grams of hydrocortisone to 150 g of a 2.5% hydrocortisone ointment. What is the amount of hydrocortisone present in the finished product in grams?

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Multiple Choice

A pharmacist adds grams of hydrocortisone to 150 g of a 2.5% hydrocortisone ointment. What is the amount of hydrocortisone present in the finished product in grams?

Explanation:
Percent by weight tells you how many grams of active are in each 100 g of the ointment. A 2.5% ointment has 2.5 g of hydrocortisone per 100 g of product. For 150 g of this ointment, the amount of hydrocortisone is 0.025 × 150 = 3.75 g. So the finished product contains 3.75 g of hydrocortisone. If additional hydrocortisone were added, the total would increase, but the 150 g batch at 2.5% contains 3.75 g.

Percent by weight tells you how many grams of active are in each 100 g of the ointment. A 2.5% ointment has 2.5 g of hydrocortisone per 100 g of product. For 150 g of this ointment, the amount of hydrocortisone is 0.025 × 150 = 3.75 g. So the finished product contains 3.75 g of hydrocortisone. If additional hydrocortisone were added, the total would increase, but the 150 g batch at 2.5% contains 3.75 g.

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