What is the product of the difference between 12.8 and 7.3 multiplied by 4.9?
12.8与7.3的差再乘4.9，积是多少．
<gadget id="calculator">12.8 - 7.3</gadget>
<output>5.5</output>

<gadget id="calculator">5.5 * 4.9</gadget>
<output>26.95</output>

<result>26.95</result>