Table: Total Cost and Output

$($Table: Total Cost and Output$)$ Use Table: Total Cost and Output, which describes Sergei's total costs for his perfectly competitive all$-$natural ice cream firm. If the market price of a tub of ice cream is $\backslash (\backslash$$ $\backslash$underline$\{\backslash$mathbf$\{65\}\}\backslash ),$ how much is Sergei's profit at the profit$-$maximizing output?

$\backslash$$$260$

$\backslash$$$85$

$\backslash$$$90$

$\backslash$$$80$