Assuming that an AGI limitation does not apply, what amounts of credit for the elderly or the disabled would be permitted in each of the following instances?

What is the Allowable Credit ?

a. A single taxpayer eligible for the credit who receives $1,800 of nontaxable social security benefits.

b. Taxpayers filing a joint return for which one taxpayer is eligible for the credit and the taxpayers have received no social security benefits.

c. Taxpayers filing a joint return, and both are eligible for the credit and received $3,800 of nontaxable social security benefits.