12. Isaac N. Corporation requires an immediate additional working capital of $350,000. There are three possible choices: Bank A - Payment term: 300 days; Total interest: $26,250 Bank B - Payment term: 320 days; Total interest: $28,933 Bank C - Payment term: 350 days; Total interest: $32,326 (a) Calculate the effective interest rate of each source of financing. (b) If the company's policy on cost of capital is 9.5%, determine which of the options are applicable for the company. (c) Determine the best option of financing for the company, based on (b)