please explain this ones. Thanks

An industrial distributor sells water pumps and other related supplies. A particular water pump is purchased for $60 from the manufacturer. The average sales per day are 5 units, and the annual holding cost is 25% of unit cost. The annual demand for the pump is 1500 units, and the order quantity is 300 units. The backorder cost per unit is $50, and the lead time is 20 days. The demand during lead time is given in the table below: What is the reorder point? a) 80 b) 90 c) 100 d) 110 e) 120 An industrial distributor sells water pumps and other related supplies. A particular water pump is purchased for $60 from the manufacturer. The average sales per day are 5 units, and the annual holding cost is 25% of unit cost. The annual demand for the pump is 1500 units, and the order quantity is 300 units. The backorder cost per unit is $50, and the lead time is 20 days. The demand during lead time is given in the table below: How much safety stock should be carried? a) 5 b) 10 c) 15 d) 20 e) : 25 An industrial distributor sells water pumps and other related supplies. A particular water pump is purchased for $60 from the manufacturer. The average sales per day are 5 units, and the annual holding cost is 25% of unit cost. The annual demand for the pump is 1500 units, and the order quantity is 300 units. The backorder cost per unit is $50, and the lead time is 20 days. The demand during lead time follows a normal distribution with a mean of 100 units and a standard deviation of 5 units What is the reorder point? Choose the closest value a) 85 b) 95 c). 105 d) 115 ef 125 An industrial distributor sells water pumps and other related supplies. A particular water pump is purchased for $60 from the manufacturer. The average sales per day are 5 units, and the annual holding cost is 25% of unit cost. The annual demand for the pump is 1500 units, and the order quantity is 300 units. The backorder cost per unit is $50, and the lead time is 20 days. The demand during lead time follows a normal distribution with a mean of 100 units and a standard deviation of 5 units How much safety stock should be carried? a) 3 b) 4 c). 5 d) 6 e) 7