Final answer:
It will take 1 hour for 100 mL to infuse through an IV regulated at 20 microgtt/min.
Step-by-step explanation:
To calculate the time it will take for 100 mL of fluid to infuse through an IV with a regulated rate of 20 microgtt/min, we need to determine the flow rate in mL/min. Since 1 microgtt is equal to 0.05 mL, the flow rate is 1 mL/min. Therefore, it will take 100 minutes for 100 mL to infuse. To convert minutes to hours, we divide by 60, which gives us 1.67 hours. Rounding to the nearest hour, the answer is d) 1 hour.