Part IThe company has also to deal with another product, the Smart $2$ model too. The annual demand for shin model is estimated to $400$ units only. One unit of this model costs PlanetMar $4000$ DHs$.$ Concerting thefixed ordering cost and the holding cost, they are respectively estimated at $5=100000$ DIs and A$=025\mathrm{.}5.$ Assuming that lots are ordered and delivered independently for each produet, determine the total annualcost for the inventory policy$\mathrm{.}6.$ Assuming that lots are ordered and delivered jointly. For each order in which the two models are joirthere is a common order cost S $=10000$ DHs$,$ and a fixed cost for each model: Smart$=1000$ DHsSsmar$2=1000$ DHs$.$ Determine the total annual cost for the inventory policy.Reminder: The expression of the optimal order frequency is n$*=$