George and Weezy received $30,500 of Social Security benefits this year ($11,700 for George; $18,800 for Weezy). They also received $5,150 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 $9,450 of dividend income from stocks owned by George.

b. George and Weezy file married separate and receive $9,450 of dividend income from stocks owned by George.

c. George and Weezy file married joint and receive $33,600 of dividend income from stocks owned by George.

d. George and Weezy file married joint and receive $16,800 of dividend income from stocks owned by George.