Refer $to$ the table below. $In$ this instance, confirmation that this firm $is$ operating $in$ a perfectly competitive market can readily $be$ ascertained $by$ the fact that its

Revenue and Cost

$\begin{array}{cc}Q& P\\ TR& MR\\ TC& MC\\ 0& \text{\$}30\\ 0& ---\\ \text{\$}15& ---\\ 1& \text{\$}30\\ \text{\$}30& \text{\$}30\\ \text{\$}25& \text{\$}10\\ 2& \text{\$}30\\ \text{\$}60& \text{\$}30\\ \text{\$}40& \text{\$}15\\ 3& \text{\$}30\\ \text{\$}90& \text{\$}30\\ \text{\$}60& \text{\$}20\\ 4& \text{\$}30\\ \text{\$}120& \text{\$}30\\ \text{\$}85& \text{\$}25\\ 5& \text{\$}30\\ \text{\$}150& \text{\$}30\\ \text{\$}115& \text{\$}30\\ 6& \text{\$}30\\ \text{\$}180& \text{\$}30\\ \text{\$}150& \text{\$}35\end{array}$

economic profits are zero.

marginal revenue $is$ constant.

marginal cost $is$ increasing.

total cost $is$ increasing.