Suppose you have a choice of working full-time during the summer or going to summer school full-time. Summer tuition and books cost $2,200. If you worked, you could earn $7,000. Your rent for the summer is $1,000 irrespective of your choice. If these are the only relevant costs to consider, the opportunity cost of going to summer school is:

The state in which the manufacturing company you work for is located regulates the presence of a particular substance in the environment to concentrations ≤ x. recently-released, reliable research endorsed by the responsible federal agency conclusively demonstrates that the substance poses no risks at concentrations up to 5x. your company has asked you to consider designing a new process with a waste discharge stream containing up to 2x of the substance. based on the stated conditions, describe this possible.