Assuming that an AGI limitation does not apply, what amounts of credit for the elderly or the disabled would be permitted in ea the following instances? a. A single taxpayer eligible for the credit who receives $1,300 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 $3.300 of nontaxable social security benefits. Allowable Credit $ 555 630