Final answer:
Rabbi Shlomo must include $63,600 as his gross income for purposes of calculating his federal income tax.
Step-by-step explanation:
To calculate Rabbi Shlomo's gross income for federal income tax purposes, we need to include his total income from various sources. In this case, his income includes his annual salary of $50,000, the utility allowance of $3,200, the fair rental value of the home owned by the synagogue ($8,000), and the earnings from his part-time job at the bookstore ($2,400).
To determine the amount he must include as gross income, we simply add up all these amounts: $50,000 + $3,200 + $8,000 + $2,400 = $63,600. Therefore, Rabbi Shlomo must include $63,600 as his gross income for purposes of calculating his federal income tax.