Jenning Co -Refer to the Trial Balance of Jenning Co

Jenning Co. adjusts its books each month but closes its books at the end of the year. The trial balance at July 31 before adjustments is as follows:
$\begin{array} { l r r } & \text { Debit } & \text { Credit } \\ \text { Cash } & \$ 12,920 & \\ \text { Accounts Receivable } & 9,620 & \\ \text { Supplies } & 1,400 & \\ \text { Prepaid Insurance } & 3,120 & \\ \text { Equipment } & 26,000 & \\ \text { Accumulated Depreciation-Equipment } && \$ 10,400 \\\text { Unearned Service Revenue } && 6,500 \\\text { Capital Stock } && 7,190 \\\text { Retained Earnings } && 23,500\\\text { Dividends } & 1,560 & \\\text { Service Revenue } & & 16,510 \\\text { Wages and Salaries Expense } & 7,800 & \\\text { Utilities Expense } & 380 & \\\text { Rent Expense } & 1,300 \\&\$ 64.100& \$ 64.100\\\end{array}$
-Refer to the trial balance of Jenning Co.(Round calculations to the nearest dollar.) If the equipment had an estimated useful life of five years and no salvage value, what is its book value at July 31, after the proper monthly July adjustment is recorded?

A) $10,400
B) $25,567
C) $15,167
D) $10,833