At a price of $$40,$ the firm will produce where Price $=$ MC$.$ From the table, MC $=40$ at an output of $4$ units.

To calculate profits: Profit $=$ Total Revenue $-$ Total Cost Total Revenue $=$ Price $*$ Output $=40*4=$ $$160$ Total Cost at $4$ units $=$ $$170$ Profit $=160-170=-$$$10$

Therefore, at a price of $$40,$ the firm would produce $4$ units and incur a loss of $$10.$