After a number is enlarged by 10 times, and then reduced to the original (1/100), it is 0.28. What is the number?
一个数扩大10倍后，再缩小到原来(1/100)后是0.28，这个数是多少．
<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<gadget id="calculator">0.28 * 10</gadget>
<output>2.8</output>

<result>2.8</result>