Given the data provided in the table below, what will the marginal cost be equal to if the current level of production is $($Q$)$ level $4$ and then production will increase to the quantity $($Q$)$ level $5?$

$\backslash$table$[[Q,$P$,$TC$,$TR$,$MR$,$MC$,$Profit$],[0,$$$5,$$$12,,,,],[1,$$$5,$$$13,,,,],[2,$$$5,$$$18,,,,],[3,$$$5,$$$22,,,,],[4,$$$5,$$$30,,,,],[5,$$$5,$$$34,,,,]]$