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Requires Respondus LockDown Browser Question 20 (2 points) =) Listen The demand during the lead-time is normally distributed with a mean of 40 and a standard deviation of 4. If the company wishes to maintain a 90 percent service level, how much safety stock should be held? 41.28 1.28 O 45.12 None of the above Question 21 (2 points) )Listen Mark 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. If Mark orders 200 units each time he places an order, what would his total ordering cost be for the year? $200 $720 $2,000 $2,720 None of the above Question 22 (2 points) =)Listen