Case A Case B Case C Case A Case B Case C Annual Rate 9% 9% 12% (a) Number of Years Involved 6 13 9 9 2.6105 12 % % Discounts per Year Annually Semianually Semiannually (b) 6 periods 26 periods 18 periods

\begin{tabular}{cccccc} & Annual Rate & & \begin{tabular}{c} Number of \\ Years Involved \end{tabular} & & \begin{tabular}{c} Discounts \\ per Year \end{tabular} \\ \cline { 1 - 2 } Case A & 9% & & 6 & & Annually \\ Case B & 9% & 13 & & Semianually \\ Case C & 12% & 9 & & Semiannually \end{tabular} (a) Case A Case B Case C 2.6105 % 12 (b) periods periods periods