Need help with question 31 please

Assume the following inventory demand forecast: Assume that carrying costs on average inventory are $0.50 per unit per time period and that purchase order costs are $50 per order. Determine the total inventory costs over the 12 time periods if the LFL lot-sizing technique is used. Using the data as given problem 27, determine the total inventory costs if EOQ lot sizing approach used. Repeat problem 28 but use the POQ approach. Repeat problem 28 but use the SM lot-sizing approach. Repeat problem 28 but use the PPB lot-sizing approach. Assume that the inventory demand for each of 12 periods of time is 50 units per period. If carrying cost on average inventory are $0.50 per unit per cost are $50 per order, determine the total