please solve and explain math behind it

Required information Problem 5-67 (LO 5-2) (Algo) [The following information applies to the questions displayed below.] George and Weezy received $31,300 of Social Security benefits this year ($12,100 for George; $19,200 for Weezy). They also received $5,350 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? (Do not round intermediate calculations. Round your final answers to the nearest whole dollar amount. Leave no answer blank. Enter zero if applicable.) Problem 5-67 Part-a (Algo) a. George and Weezy file married joint and receive $9,850 of dividend income from stocks owned by George. Amount to be included in gross income 4 Required information Problem 5-67 (LO 5-2) (Algo) [The following information applies to the questions displayed below.] George and Weezy received $31,300 of Social Security benefits this year ($12,100 for George; $19,200 for Weezy). They also received $5,350 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? (Do not round intermediate calculations. Round your final answers to the nearest whole dollar amount. Leave no answer blank. Enter zero if applicable.) es Problem 5-67 Part-b (Algo) b. George and Weezy file married separate and receive $9,850 of dividend income from stocks owned by George. George Weezy Amount to be included in gross income Required information Problem 5-67 (LO 5-2) (Algo) [The following information applies to the questions displayed below.) George and Weezy received $31,300 of Social Security benefits this year ($12,100 for George; $19,200 for Weezy). They also received $5,350 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? (Do not round intermediate calculations. Round your final answers to the nearest whole dollar amount. Leave no answer blank. Enter zero if applicable.) Problem 5-67 Part-c (Algo) c. George and Weezy file married joint and receive $34,400 of dividend income from stocks owned by George. Amount to be included in gross income Required information Problem 5-67 (LO 5-2) (Algo) [The following information applies to the questions displayed below.] George and Weezy received $31,300 of Social Security benefits this year ($12,100 for George; $19,200 for Weezy). They also received $5,350 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? (Do not round intermediate calculations. Round your final answers to the nearest whole dollar amount. Leave no answer blank. Enter zero if applicable.) Problem 5-67 Part-d (Algo) d. George and Weezy file married joint and receive $17,200 of dividend income from stocks owned by George. Amount to be included in gross income