Uncle Li has contracted a circular pond with a circumference of 314 meters to raise fish. It is estimated that this year the pond will produce an average of 2 kilograms of fish per square meter. How many kilograms of fish is expected to be produced in this pond this year?
李大伯承包了一个周长是314米的圆形池塘养鱼，预计今年平均每平方米池面产鱼2千克，这个池塘今年预计总共产鱼多少千克？
<gadget id="calculator">314 / 3.14 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 ** 2</gadget>
<output>2_500</output>

<gadget id="calculator">3.14 * 2_500</gadget>
<output>7_850</output>

<gadget id="calculator">7_850 * 2</gadget>
<output>15_700</output>

<result>15_700</result>