Rian's profit is maximized when they produce a total of $\boxed{}$ rompers. At this quantity, the marginal cost of the final romper they produce is $\boxed{less}$ than the price received for each romper they sell. At this point, the marginal cost of producing one more romper (the first romper beyond the profit maximizing quantity) is $\boxed{$}$ , an amount $\boxed{greater}$ than the price received for each romper they sell.
Therefore, Rian's profit-maximizing quantity occurs at the point of intersection between the $\boxed{MC}$ and $\boxed{MR}$ curves.
Because Rian is a price taker, the previous condition is equivalent to $\boxed{MC=MR}$.
