a married taxpayer, age 48, received the following in year 1: interest earned on federal treasury bills $ 1,000 interest earned on municipal bonds 2,500 interest earned on state income tax refund 50 interest earned on series ee savings bonds, used to help pay for room and board for dependent in college 1,500 given these facts, what total amount from the above should be included in gross income on the taxpayer's year 1 tax return?