If demand is $5000$ ?per $?$ ?month, the fixed ordering cost is $?$ $ $30,$ ?the interest on tied $-$ up money is $20\%,$ ?and the purchase cost is $?$ $ $6$ ?per unit, then

a $)$ ?What is the economic order $?$ ?quantity? The EOQ is units $?($ round your response to the nearest whole $?$ ?number $).$

$?$ b $)$ ?How does your answer change if the unit cost doubles? The EOQ changes to units $?($ round your response to the nearest whole $?$ ?number $).$

$?$ c $)$ ?What if the interest rate drops in $?$ ?half? The EOQ changes to units $?($ round your response to the nearest whole $?$ ?number $).$