Final answer:
To find out how many units are needed for each product, divide the total number of units needed by the number of units per case. In this case, the correct answer is 11.25 units.
Step-by-step explanation:
To find out how many units are needed for each product, divide the total number of units needed by the number of units per case. In this case, 90 units are needed and 8 units come per case.
So, 90 ÷ 8 = 11.25 units
Therefore, the correct answer is d) 11.25 units.