Third time posting this on here, its been wrong twice looking for accurate answer with explanation please.

Problem 20-38 A particular raw material is available to a company at three different prices, depending on the size of the order Less than 100 pounds $20r 100 pounds to 999 pound $19 Per 1,000 pounds or more $18 per pound The cost to place an order is $40. Annual demand is 4,100 units. Holding (or carrying) cost is 25 percent of the material price. What is the economic order quantity to buy each time, and its total cost? Round your answers to the nearest whole number.) Economic order 640 pounds 624 quantity Total cost