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? 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.

Suppose life expectancy in years (l) is a function of two inputs, health expenditures (h) and nutrition expenditures (n) in hundreds of dollars per year. the production function is upper l equals ch superscript 0.40 baseline upper n superscript 0.60l=ch0.40n0.60. beginning with c = 1, a health input of $400400 per year (hequals=44) and a nutrition input of $400400 per year (nequals=44), show that the marginal product of health expenditures and the marginal product of nutrition expenditures are both decreasing. the marginal product of health expenditures when h goes from 44 to 55 is nothing, and the marginal product of health when h goes from 66 to 77 is nothing. (round your answers to three decimal places.)