Answer:
Compute their standard deduction assuming that Mr. Keppner is age 68, and Mrs. Keppner is age 60.
Compute their standard deduction assuming that Mr. Keppner is age 70, and Mrs. Keppner is age 68.
Compute their standard deduction assuming that Mr. Keppner is age 70, and Mrs. Keppner is age 68. Mrs. Keppner is legally blind.
Explanation:
The regular standard deduction for married filing jointly is $24,800 during 2020, but for every person over 65, they get an additional $1,300. This also applies if any of them is blind.
If the tax filer is single or married filing separately, then the additional amount is $1,650.