Take the product of 3.6 and 2.5 and add 7.2. What is half the sum?
用3.6与2.5的积，加上7.2，所得的和一半是多少？
<gadget id="calculator">3.6 * 2.5</gadget>
<output>9</output>

<gadget id="calculator">9 + 7.2</gadget>
<output>16.2</output>

<gadget id="calculator">16.2 / 2</gadget>
<output>8.1</output>

<result>8.1</result>