Use the following to answer the given question
DEBTORS CONTROL ACCOUNT:
\(\begin{array}{c|c} & N & N \\ \hline \text{ Balance b/d} & 8,000 & & \\ & & Bank & \text{"Y"} \\ \text{'X"} & 12,000 & Discount & 200 \\ & & \text{Balanced c/d} & 3,000\end{array}\)
'X' refers to