What would be the net annual cost of the following checking accounts? a. Monthly fee, $3.25; processing fee, 45 cents per check; assume checks written average to 14 per month. (Round your answer to 2 decimal places.) Net annual cost 114.6 b. Interest earnings of 5 percent with a $500 minimum balance; average monthly balance. $720; monthly service charge of $13 for falling below the minimum balance, which occurs four times a year (no interest earned in these months). (Do not round intermediate calculations. Round your answer to 2 decimal places.) Net annual cost $