$$

$$

$$inventory manager believes that ordering

$7$

$5$

$0$

$$units

$$

$$

$$

$$

$$item every month will minimize the total costs

$$

$$

$$the item costs $

$3$

$0$

; and each order costs $

$2$

$0$

$0$

$$for placement, processing, and delivery

$.$

$$calculate the percentage

$$inventory holding costs