discount is =103.09 , how? pls explain

2) Markus received an invoice dated April 25, 2019 for $22760 with the following terms: 3/10. 2/30, n/45 a. If he paid $10 000 on May 5, what was the outstanding balance? b. After his first payment, he a second payment on May 154. How much would his second payment be to reduce the balance to $5000