I'm having a hard to trying to answer the below 2 questions. Can you please help?

Stillwater Drinks is trying to determine when to harvest the water from the fountain of youth that it currently owns. If it harvests the water in year 1, the NPV of the project would increase over an immediate harvest by 18 percent. A year 2 harvest would make an NPV increase of 12 percent over that of year 1 and year 3 would make an NPV increase of 8 percent over that of year 2. If the cost of capital is 17 percent for Stillwater, then which harvest year would maximize the NPV for the firm? Assume that all NPVs are calculated from the perspective of today.

Harvest in year 2.

Harvest immediately.

Harvest in year 3.

Harvest in year 1.

When to replace an asset: Burt's Pizzas is considering whether to purchase an oven. Burt's calculates that its current oven generates $4,000 of cash flow per year. A new oven would cost $15,000 and would provide cash flow of $6,000 per year for six years. What is the equivalent annual cash flow for the new oven (round to the nearest dollar), and should Burt's purchase the new oven? Assume the cost of capital for Burt's is 12 percent.

$2,352, do not purchase the oven

$6,000, purchase the oven

$9,668, purchase the oven

$24,668, purchase the new oven