Bank of America will begin testing a new slate of checking accounts in Massachusetts and two other states later this month in an effort to generate more revenue from customers.......... A second new account, called “Premium,’’ will cost $15 a month unless customers either maintain a $5,000 minimum balance, use a Bank of America credit card at least once a month, or add $2,000 to the account every month. A third new account, labeled “Enhanced,’’ will cost $25 per month unless holders maintain at least $20,000 in deposits and investments in certain accounts or link their accounts to a Bank...