Mark Achin sells $3,600$ electric motors each year. The cost of these is $$200$ each, and demand is constant throughout the year. The cost of placing an order is $$40,$ while the holding cost is $$20$ per unit per year. There are $360$ working days per year and the lead$-$time is $5$ days.. In the past Mark ordered $200$ units each time he placed an order. He is now considering EOQ to make inventory ordering decisions. What would be the difference in holding cost be for the year $?$