Donald has made up his mind-he wants a pool in the family's backyard! He figures his kids and spouse will be thrilled. However, to cover the cost of the pool, they'll have to pack up and live away from home for a few weeks during the summer to rent their home to vacationers. He crunched the numbers based on the following estimates. Donald's daughter, Sarah, found the above information written on a sheet of paper in his office, along with the following notes. "This is a no-brainer! We'll recover the cost of this pool in just 7 years, even though we plan to live here until we're old and gray, or at least as long as the pool hangs on. If we can rent our house out for just 3 weeks each year, it'll be almost pure profit that we can put toward paying off the pool. I studied time value of money a little bit in college; the present value of this investment is positive, so therefore we should definitely move ahead with it. My family will think they're in heaven." (b) Determine the simple payback period using (1) before-tax dollars and (2) after-tax dollars. (Round intermediate calculations and final answer to 2 decimal places, e.g. 15.25.) Does Donald's payback period agree with either of these? Determine the NPV of this investment. (Round present value factor calculations to 5 decimal places, e.g. 1.25124 and final answer to 0 decimal places e.g. 125.25. Enter negative amounts using either a negative sign preceding the number e.g. -45.25 or parentheses e.g. (45.25).) NPV \$ Is Donald's recognition of a positive NPV consistent with your determination? Is there any quantitative basis for moving ahead with the pool? (Hint: Since the home will be rented for only 3 weeks of the year in this option, depreciation expense on Donald's tax return can only be claimed for that period of time.)