Gordon paid the $10000 balance of his federal income tax three months late. Ignore daily compounding of interest. Determine the interest rate that applies relative to this amount, assuming that:
A. Gordon is an individual.
B. Gordon is a C corporation.
C. The $10000 is not a tax that is due but is a refund payable by the IRS to Gordon (an individual).
D. The $10000 is not a tax that is due but is a refund payable by the IRS to Gordon (a C corporation).