Question 24 of 30 Robert retired from the railroad after 50 years of service at age 70 in 2019. He is a widower and files as single. He received a Form RRB-1099 with $15.099 in box S. He received a Form RRB-1099-R with $17.455 in box 7 and reports it on line 4d of his Form 104071040-SR. He received no other taxable income. Up to of his Tier 1 benefits may be taxable. O 0% 50 O 85% O 100 Mark for follow up