What would be the account balance in the revenue ledger account after the following transactions?

Performed services and left a bill...$4200

Performed servies and collected immediately...$3500

Performed services and billed customer...$2200

Performed services on accounts...$6000

Recevied partial payment on account...$1500

Select one:

a. $17,400

b. $10,900

c. $14,400

d. $9,000

e. $15,900