A business recorded a gross profit margin of $25\%$. For that year, the information given is: Revenue from sales: $200\,000$ Inventory at the start: $10\,000$ Inventory at the end: $5000$ What amount were the purchases for the year?
- A$135\,000$
- B$145\,000$
- C$155\,000$
- D$165\,000$