Mila Cabellero has $100 in income this year and will have zero income next year. The expected return from investing in the stock market is 10 percent a year. Ms. Cabellero also has an investment opportunityhaving the same risk as the market in which she can invest $50 this year and receive $80 next year. Suppose Ms. Cabellero consumes $50 this year and invests in the project. What is the NPV of the investment opportunity?