EOQ models, however complex, are restricted by so many assumptions that they have very limited practical value." Do you agree with this statement? Illustrate your answer.$(8$ Marks$)$b$.$ The office manager of the Metro Life Insurance company orders letterhead stationery from an office products firm in boxes of $500$ sheets. The company uses $6500$ boxes per year. Annual carrying costs are Ksh$.30$ per box and ordering cost are Ksh$.280.$ The discount price schedule is provided by the office supply in the table below.Order Quantity $($boxes$)$Price per box $($Kshs$)200-9991000-29993000-59996000-$AboveRequired:$160140130120$Determine the optimal order quantity and the total annual inventory costs