Round each month's sales to the nearest thousand:<br>
&bull; 2,387 → 2,000<br>
&bull; 5,634 → 6,000<br>
&bull; 4,829 → 5,000<br><br>
Estimated total = 2,000 + 6,000 + 5,000 = 13,000<br><br>
Final Answer: 13,000