Why not just use Answers ?

While generally isn't a terrible media to go to for answers, it's freemium. It paywalls user generated content with advertisements and paid plans in order to profit where other companies don't.

What makes worth feeding or paying for while there are genuinely free businesses that are more adept at the task tries to accomplish?

First one was deleted. I'm going to assume it was because of the link.

The manager of the quick stop corner convenience store (which never closes) sells four cases of stein beer each day. order costs are $8.00 per order, and stein beer costs $.80 per six-pack (each case of stein beer contains four six-packs). orders arrive three days from the time they are placed. daily holding costs are equal to 5 percent of the cost of the beer. if he were to order 16 cases of stein beer at a time, what would be the average inventory level? a. 0.25 days b. 3 days c. 1 day d. 4 days e. 20 days