Answer:
b. $800
Explanation:
For computing the total annual inventory cost first we have to compute the economic order quantity which is shown below:
[tex]= \sqrt{\frac{2\times \text{Annual demand}\times \text{Ordering cost}}{\text{Carrying cost}}}[/tex]
[tex]= \sqrt{\frac{2\times \text{4,000}\times \text{\$20}}{\text{\$4}}}[/tex]
= 200 units
The total cost of ordering cost and carrying cost equals to
= Annual ordering cost + Annual carrying cost
= Annual demand ÷ Economic order quantity × ordering cost per order + Economic order quantity ÷ 2 × carrying cost per unit
= 4,000 ÷ 200 units × $20 + 200 ÷ 2 × $4
= $400 + $400
= $800
We simply applied the above formulas