Central College received an invoice on April 18 from Lakeside Glass for the installation of a glass partition wall. The invoice for $18,986.45 was dated April 16 with terms 2/15, 1/30, n/45. (Round your answers to 2 decimal places.) a. What is the balance after a payment of $11,000 on May 1? Balance owed = $ b. What additional payment on May 15 will settle the account? Payment to settle account = $