Elizabeth owns an Airbnb property large enough to do multiple bookings simultaneously. She charges an average of $$100$ per nightly stay. The variable cost per nightly stay is $$20,$ to cover custodial and utilities. Elizabeth pays $$25,000$ for the mortgage and $$5,000$ in property taxes and insurance $($per year for each$).$ How many nightly stays must she book to break even, where it is given by fixed costs divided by contribution margin?