Wedge Investment Group has suggested an investment that will pay you $600 per quarter in each of the next 6 years. At the end of that time, it will pay you an additional $25,000. a) If this investment costs you $20,000, what is its internal rate of return? b) If your required rate of return on this investment is 16 percent, what is its NPV assuming the same $20,000 purchase price?