It is known that A*B=20, if A is multiplied by 5, and B is also multiplied by 5, what is the product.
已知A*B=20，如果A乘5，B也乘5，积就变为多少．
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">20 * 25</gadget>
<output>500</output>

<result>500</result>