Choosing a Gym Membership:
You are comparing two local gyms to see which one is the better deal.
Gym A: Charges a $50 joining fee and then $20 per month.
Gym B: Has no joining fee but charges $30 per month.
After how many months will the total cost of both gyms be exactly the same?
After 4 months, which gym is cheapere to be a member of?
Show your work for credit.