Over your Christmas vacation, you decided to go on an expedition to Kolepom Island because you heard there was a sighting of Attenborough's echidna there! Unfortunately, soon after you arrived at the village to meet your guide, the chief of the tribe took your weapons and locked you in a hut.
It seems the chief will not deal with any Westerners unless they prove that they respect the tribe's culture. He has given you the problem below to prove your worth. If you can solve it before the sun sets, he will be your personal guide to find Attenborough's echidna which he claims to have seen with his own eyes. But if you fail, you will be cooked and eaten at their annual feast of the echidna in three days time.
Congratulations, you helped the first mate get his GED! But now you've got another problem--your pet marsupial moles are almost out of food! Their favorite meal is ant larvae so you'd like to order more for them. However, you don't know how much they cost. The first mate ordered the previous two shipments but he doesn't remember how much they cost per pound.
However, he does have his credit card statements which show the first batch was $12.25 and the second batch was $21.75. He also remembers that the first batch was $2 a pound more expensive because of extra shipping costs. And the second batch was $2 per pound cheaper because he picked it up at the warehouse himself. And he knows that he received five pounds total for the last two shipments. From this information, figure out the regular price (in dollars per pound) for ant larvae.
