George and Weezy received $30,200 of Social Security benefits this year

($12,000 for George; $18,200 for Weezy). They also received $5,000 of interest from jointly owned City of Ranburne bonds and dividend income. What amount of the Social Security benefits must George and Weezy include in their gross income under the following independent situations?

a) George and Weezy file married joint and receive $8,000 of dividend income from stocks owned by George.

b) George and Weezy file married separate and receive $8,000 of dividend income from stocks owned by George.

c) George and Weezy file married joint and receive $30,000 of dividend income from stocks owned by George.

d) George and Weezy file married joint and receive $15,000 of dividend income from stocks owned by George.