With a pump delivering 0.25 mL per actuation, how many milliliters are used daily if four actuations are performed per day?

• A. 1 mL
• B. 0.5 mL
• C. 2 mL
• D. 0.25 mL

Answer: (A)

Each actuation delivers 0.25 mL, and there are four actuations daily. Multiply the dose per actuation by the number of actuations: 0.25 mL × 4 = 1 mL per day. (0.25 mL is a quarter of a milliliter, and four quarters make one full milliliter.) The other totals would require different numbers of actuations: 0.5 mL would be two actuations, and 2 mL would require eight actuations.