The owner of a photocopy store charges 9 cents per copy for the first 100 copies and 6 cents per copy for each copy exceeding 100. In addition, there is a setup fee of $2.70 for each photocopying job. (a) Determine R(x), the revenue from doing one photocopying job consisting of x copies. (b) If it costs the store owner 3 cents per copy, what is the profit from doing one photocopying job consisting of x copies? (Recall that profit is revenue minus cost.)