Assume the price of basic white T$-$shirts in a perfectly competitive market is $$21$ and that the typical firm confronts the following costs: O$8-3$ Quantity$($T$-$shirts per day$)012345678910$Total cost$$10$$$17$$$26$$$37$$$50$$$65$$$82$$$101$$$122$$$145$$$170$

What is the profit$-$maximizing rate of output for the firm?

t$-$shirts per dayHow much profit does the firm earn at that rate of output?

If the price of basic white T$-$shirts fell to $$15,$

how many T$-$shirts should the firm produce?

At what price should the firm shut down?