Tony is currently operating a small newsstand. Unsold newspapers will be returned to the publishers for full refunds. The monthly rent of the newsstand is $30,000 on a monthly contract (renewable at the end of each month). Rent is paid at the beginning of each month and is not recoverable. His monthly sales revenue in excess of the costs of newspapers is expected to be $20,000. Tony believes he cannot find a new job or new income sources for a long period if he closes the newsstand. There are no other costs and revenue involved. (a) Should he shut down or continue to operate next month? Briefly explain. Should he shut down or continue to operate before next month? Briefly explain. (b)