What would be the net annual cost of the following checking accounts? a. Monthly fee, $3.50; processing fee, 50 cents per check; assume checks written average to 15 per month. (Round your answer to 2 decimal places.) Net annual cost b. Interest earnings of 2 percent with a $500 minimum balance; average monthly balance, $900; monthly service charge of $14 for falling below the minimum balance, which occurs five times a year (no interest earned in these months). (Do not round intermediate calculations. Round your answer to 2 decimal places.) Net annual cost