Contemporary Furnishings received an invoice on April 18 from Palliser Furniture. The invoice for $18,976.45 was dated

Question:

Contemporary Furnishings received an invoice on April 18 from Palliser Furniture. The invoice for $18,976.45 was dated April 16 with terms 2/15, 1/30, n/45.
a. What is the balance after a payment of $10,000 on May1?
b. What additional payment on May15 will settle the account?