County Bank Had the Following Activities, Traceable Costs, and Physical

County Bank had the following activities, traceable costs, and physical flow of driver units: $$\begin{array} { l l l } & \text { Traceable } & \text { Physic al Flow of } \\\text { Activities } & \text { Costs } & \text { Driver Units } \\\text { Open new acc ounts } & \$ 50,000 & 1,000 \text { accounts } \\\text { Process deposits } & 36,000 & 400,000 \text { deposits } \\\text { Process with draw als } & 15,000 & 200,000 \text { withdrawals } \\\text { Process loan applications } & 27,000 & 900 \text { applications }\end{array}$$ The above activities are used by North County branch and South County branch: $$\begin{array} { l l l } & \text { North } & \text { South } \\\text { New accounts } & 200 & 400 \\\text { Deposits } & 40,000 & 20,000 \\\text { Withdrawals } & 15,000 & 18,000 \\\text { Loan applications } & 100 & 160\end{array}$$ The deposit cost assigned to the South County branch is:

A) $36,000
B) $3,600
C) $5,400
D) $1,800