An IV set delivers 31 drops/min using a 20 gtt/ml set. How much volume will be infused in 12 hours?

Correct option is C

Flow rate = 31 ÷ 20 = 1.55 ml/min. In 60 minutes, this equals 93 ml/hr. For 12 hours, total volume = 93 × 12 = 1,116 ml.
Explanation of options: (a) ✘ 900 ml corresponds to about 25 drops/min, not the actual 31. This underestimates volume infused. (b) ✘ 1,050 ml matches ~29 gtt/min, which is not the given rate, so it’s slightly lower than correct. (c) ✔ Correct; exact math confirms 1,116 ml infused at 31 gtt/min with 20 gtt/ml set. (d) ✘ 1,200 ml would mean 100 ml/hr, which is higher than the actual 93 ml/hr.