At the beginning of January of the current year, Thomas Law Center's ledger reflected a normal balance of $55,800 for accounts receivable. During January, the company collected $18,600 from customers on account and provided additional services to customers on account totaling $14,400. Additionally, during January one customer paid Thomas $6,900 for services to be provided in the future. At the end of January, the balance in the accounts receivable account should be:

1. 51,600
2. 58,500
3. 60,000
4. 53,100
5. 4,200