Wattan Company reports beginning irwentory of 25 units at $30 each. Every week for four weeks it purchases an adoitional 25 units at respective costs of $31,532,$35, and $40 per unit for weeks 1 through 4 . Compute the cost of goods avaliable for sale and the units avallable for sale for this four-week period. Assume that no sales occur during those four weeks