i just need help solving economic order quantity

What is the economic order quantity? 320 640 488 6000 548 A firm sells a product with an annual demand of A-6000. The holding cost is CH-52 per unit per year and the ordering cost is Cp$50 per order. The shortage cost is Cs=$10 per unit. Demand exhibits some variability and management has estimated that lead-time demand follows a normal distribution with a mean of 300 and standard deviation of 40, What is the reorder point if management wants a 50% probability of satisfying demand in any given cycle? 380 6000