Round each month's production to the nearest thousand:<br>
&bull; 12,640 → 13,000<br>
&bull; 8,470 → 8,000<br>
&bull; 9,810 → 10,000<br><br>
Estimated total = 13,000 + 8,000 + 10,000 = 31,000<br><br>
Final Answer: 31,000