A music store carries exactly ten types of CDs-both new and used of each of jazz, opera, pop, rap, and soul. The store is having a sale on some of these types of CDs.

If new jazz is on sale, then used jazz is on sale.
If new opera is on sale, then used opera is on sale.
If new pop is on sale, then used pop is on sale.
If new rap is on sale, then used rap is on sale.
If new soul is on sale, then used soul is on sale.

How many different sales can a music store offer that satisfy these conditions?
We regard two sales as the same if and only they place the same types of CD on
sale.