Keith wants to join liberty record club, which is offering new members a $20 membership fee and a cost of only $6.20 per CD. On the other hand, patriot music club charges no membership fee and cost of each cd is $8.10. Deanna wants to join patriot. Keith and Deanna are married, so they don't need to both join clubs. How many CD's would they need to buy before liberty would be cheaper? Use a guess and check method.