Question

A golf course charges $18 to golf 18 holes and $7 for a cart for a no-member.

To become a member you have to pay $560 and $5 for a cart for each round
of 18 holes you golf. How many times would you have to golf 18 holes with a
cart to justify becoming a member?
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Answer 1

at least 81 times. playing 80 times would mean you played exactly what it's worth, 7*80=560, so playing 81 times means you pocket a difference of 7 dollars. if you're going to be playing at least 81 times yearly, go for the membership..