The Keppners file a joint income tax return. Assume the taxable year is 2022. Required:

a. Compute their standard deduction assuming that Mr. Keppner is age 68, and Ms. Keppner is age 60.

b. Compute their standard deduction assuming that Mr. Keppner is age 70, and Ms. Keppner is age 68.

c. Compute their standard deduction assuming that Mr. Keppner is age 70, and Ms. Keppner is age 68 and legally blind.