Calculate the number of exemptions that could be claimed and the standard deduction that the taxpayer is entitled to take in 2018 in each of the following independent cases:

a. John, age 66, and his wife, age 64, file a joint return.

b. Jack, age 62 and blind, and his wife, who became 65 on January 1 of the following year, file a joint return.

c. Jim and Mary, both 52, contribute more than half the support for Jim's father, who lives with them. Jim's father is 72 and blind. Jim and Mary file a joint return.

d. Harry, age 66, is a widower who maintains a home for himself and his 22 -year-old son who attends college full time. Harry provided more than one half of his son's support.

e. Jackson is 28 and his wife, Joan, is