The Doore Knob Company's Accounting Records Are Set Out Below

The Doore Knob Company's accounting records are set out below: $\begin{array}{lcc}&\text { Beginning Balance }&\text {Ending Balance }\\&1000 & 1000 \\&\$ & \$\\\text { Accounts receivable } & 15 & 22 \\\text { Accounts payable } & 10 & 8 \\\text { Prepaid expenses } & 12 & 16 \\\text { Inventory } & 20 & 23 \\\text { Sales } & - & 80\\\text { Cost of sales }&-&30\\\text { Expenses (other than cost of sales) }&-&21\end{array}$ Determine the amount of cash paid for purchases of inventory during the period.

A) $25 000
B) $29 000
C) $35 000
D) $33 000