Capital Bank in Geneva, Switzerland, offered Roger Federer a special offer on a bank account that paid 1.5%. Roger opened an account on May 1, and the following transactions occurred: 1. Roger deposited $4,000 on May 1 to open the account 2. He deposited another $4,000 on May 10 3. He withdrew $5,000 on May 21 to travel to a tennis tournament 4. He deposited the winnings from the tournament of $10,000 on May 27. Calculate the interest revenue that Roger earned in the month of May