Two people have come to your restaurant with different offers.
Sam	"I'll sell you a brand new soft-serve ice cream machine. It'll cost $4,000 and should provide you with an extra $1,000 of revenue every year. You'll only have to pay about $100/year to maintain it, and it should last for nine years.
Ella	"I run a party venue just down the street from your restaurant. I'll charge you $10,000 to put signage up in the venue, and you can become my preferred caterer for weddings, bar mitzvahs, etc. I bet I can get you $50,000 of additional revenue every year, and I know your contribution margin is around 10%. Let's say this arrangement will last for five years."
	Your required rate of return is 7%.
1	What's the payback period for each of these offers?
2	What's the NPV of each of these offers?
3	What's the approximate IRR of each of these offers?