What would be the net annual cost of the following checking accounts? a. Monthly fee, $2.50: processing fee, 20 cents per check; checks written, an average of 18 a month. (Round your answer to 2 decimal places. Input the amount as a positive value.) Net annual cost $ 73 20 b. Interest earnings of 4 percent with a $600 minimum balance; average monthly balance, $900; monthly service charge of $16 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. Input the amount as a positive value.) Net annual cost