For each of the following transactions, determine if Raymond Corporation has earned revenue during the month of May and, if so, how much it has earned. 

1. Customers paid Raymond $1,500 for work Raymond will perform in June. 

2. Customers purchased $6,000 of inventory for which they have not yet paid.

 3. Raymond performed work for customers and was paid $3,400 in cash. 

4. Customers paid Raymond $2,300 for inventory purchased in April.