Please explain this problem tareel company

Tar heel specialized portfolio cases. It expects to sell 20,000 cases next year at $75 each. There is a beginning inventory of 1, 500 cases and the company wants to have an ending inventory equal to 30 percent of this year's sales. How many eases need to be produced? 15, 500 20,000 24, 500 26,000 Whitney Smith Company makes two products: x and y. they are initially processed from the same raw material and titan, after split off, further processed separately. Additional information is as follows