(a) On March 2, Sheridan Company sold $893,700 of merchandise to Skysong Company on account, terms 2/10, n/30. The cost of the merchandise sold was $577,200. (b) On March 6, Skysong Company return $119,100 of the merchandise purchased on March 2. The cost of the merchandise returned was $61,300. (c) On March 12, Sheridan Company received the balance due from Skysong Company.

When a company produces and sells x thousand units per week, its total weekly profit is p thousand dollars, where upper p equals startfraction 800 x over 100 plus x squared endfraction . the production level at t weeks from the present is x equals 4 plus 2 t. find the marginal profit, startfraction dp over dx endfraction and the time rate of change of profit, startfraction dp over dt endfraction . how fast (with respect of time) are profits changing when tequals8?