(Mod­er­ately dif­fi­cult)

Reader's Digest (Canada) - - Brainteasers -

You just bought nine beau­ti­ful lake­side camp­sites, which you can rent out to campers with tents for $20 per camp­site per evening. You can also up­grade the sites with elec­tri­cal hookups: this will cost you $60 per camp­site but will al­low you to rent them to RVers for $40 per evening. Sup­pose you can al­ways fill your camp­ground to ca­pac­ity. If you’re start­ing with­out any cash on hand, how many nights will pass be­fore you’ll be able to up­grade all nine sites?

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