What is the sum of 78 times 6.4 plus 30% of 2.4?
78乘6.4加上2.4的30%，和是多少？
<gadget id="calculator">78 * 6.4</gadget>
<output>499.2</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">2.4 * (3/10)</gadget>
<output>0.72</output>

<gadget id="calculator">499.2 + 0.72</gadget>
<output>499.92</output>

<result>499.92</result>