Consider the following information from a companys unadjusted trial balance at December 31, 2015. All accounts have normal balances.

Accounts receivable	$	4,900
Accounts payable		670
Cash		1,740
Service revenue		6,020
Common stock		4,400
Equipment		5,300
Insurance expense		420
Land		4,200
Notes payable, due 2018		4,400
Notes receivable, matures 2016		1,240
Prepaid insurance		420
Rent expense		1,420
Retained earning, January 1, 2015		7,890
Salaries and wages expense		3,740

What is the total of the debit side of the unadjusted trial balance?

$18,980.

$23,380.

$14,880.

$18,310.