Balloons By Sunset (BBS) is considering the purchase of two new hot air balloons so that it can expand its desert sunset tours. Various information about the proposed investment follows: Assume straight line depreciation method is used. Help BBS evaluate this project by calculating each of the following: 1. Accounting rate of return. Payback period. Net present value (NPV). Recalculate the NPV assuming BBS's cost of capital is 15 percent