At the start of the financial year, inventory had a value of $\text{\$}15000$. Over the year, sales of $\text{\$}21000$ and purchases of $\text{\$}18000$ took place. Regrettably, every item of inventory was stolen on the final day of the financial year. Goods are marked up by $50\%$ to work out selling price. What is the cost of the stolen inventory?
- A$\text{\$}7500$
- B$\text{\$}11000$
- C$\text{\$}19000$
- D$\text{\$}22500$