How many units of insulin each hour is being received by the client?

The correct answer is 5.

Rationale: To determine the number of insulin units the client is receiving per hour, the nurse must first determine the number of units in each ml of fluid (50 units 100 ml = 0.5 units/ml). Next, she multiplies the units/ml by the rate of ml/hour (0.5 units 10 ml/hr = 5 units).