Suppose the revenue $($in dollars$)$ from the sale of $x$ units of a product is given by the equation $R(x)=\frac{50x^2+72x}{4x+4}.$ Find the marginal revenue when $48$ units are sold. Round your answer to the nearest dollar.

$R^{\text{'}}(48)$~~$$14$

$R^{\text{'}}(48)$~~$$12$

$R^{\text{'}}(48)$~~$$13$

$R^{\text{'}}(48)$~~$$26$

$R^{\text{'}}(48)$~~$$27$