The annual demand for an item is $1000$ units. Ordering cost is $$20$ per order, and inventory carrying cost is $0\mathrm{.}35\%$ of unit price. The larger the order quantity is$,$ the less we pay per unit. Price is determined by the following discount schedule.

Order Quantity Price per Unit $($ P $)$ Holding cost

Q$11$ to $400$ $ $6\mathrm{.}00$ $ $2\mathrm{.}40$

Q$2401-1999$ $ $5\mathrm{.}75$ $ $2\mathrm{.}30$

Q$32,000$ or more $ $5\mathrm{.}20$

Calculate the per unit holding cost for Quantity $3($green box$).$