Please give the correct Answer with explanation

What is the short-run profit-maximizing quantity of the pure competition firmed portrayed on the table (hint: fill-in only the columns you need to obtain the answer): Q TFC TVC TC MC P TR MR Profit 20 0 64 20 60 64 2 20 100 64 20 120 64 20 136 64 20 148 64 20 162 64 20 186 64 B 20 230 64 9 20 294 64 10 20 384 64 Q = 10