The school has 4 corn experimental fields, each of which is 13 meters long and 8 meters wide. 12 rows of corn were planted in each experimental field, with 28 plants in each row. Ask math questions and answer them.
学校有4块玉米实验田，每块实验田长13米，宽8米．每块实验田种12行玉米，每行28棵．请提出数学问题并解答．
<gadget id="calculator">13 * 8</gadget>
<output>104</output>

<result>104</result>