a$.$ A single$-$stock futures contract on a non$-$dividend$-$paying stock with current price $$260$ has a maturity of $1$ year. If the T$-$bill rate is $5\%,$ what should the futures price be$?($Round your answer to $2$ decimal places.$)$

b$.$ What should the futures price be if the maturity of the contract is $4$ years? $($Do not round intermediate calculations. Round your answer to $2$ decimal places.$)$

c$.$ What should the futures price be if the interest rate is $8\%$ and the maturity of the contract is $4$ years? $($Do not round intermediate calculations. Round your answer to $2$ decimal places.$)$