Use the following to answer the given question
\(\begin{array}{c|c} & N & & N \\ \hline \text{Opening stock} & 1,200 & sales & 29,000 \\ Purchases & ? & \text{Less sales returns } & 500 \\ \text{Add. Carriage Inwards} & 300 & & ? \\ \text{Less return outwards} & 1,570 \\ & 28,500 \\ \text{Less closing stock} & 2,220 & \\ \text{Gross Profit(25% of sales)} & 28,500 & & 28,500 \end{array}\)
What is the cost of goods purchased?