(Determining relevant cash flows) A business in a small town in southern England believes that it has an opportunity to increase its sales revenue from mobile phones by either 5 percent, 10 percent, or 15 percent through an innovative marketing campaign. The marketing cost will reduce the operating margin of 10 percent by

£25,000. If current sales are £3 million, what level of sales needs to be achieved to deliver additional NOPAT assuming a tax rate of 20 percent? What other risks ought to be considered?