A company is considering buying licenses for 12 megahertz of wireless spectrum in the 700 MHz range, which is suitable for delivering television to mobile phones. The 700 MHz signals can travel long distances and more easily penetrate walls and other obstacles. The acquisition cost is $150 million. In addition, because networks that operate in the 700 MHz range are less expensive to build than those in other portions of the spectrum, the company estimates annual costs of $15 million over the next 8 years and no salvage value. During the same period, the company expects to generate annual revenue of $18 million by offering television arid video to mobile-phone users. Calculate the net present worth of this investment and determine the acceptability of the investment if the company's minimum attractive rate of return is 15% per year.