Add 4.5 to the quotient of 8.4 divided by 21, and multiply the sum obtained by 1.5. What is the product?
4.5加上8.4除以21的商，所得的和再乘1.5，积是多少？
<gadget id="calculator">8.4 / 21</gadget>
<output>0.4</output>

<gadget id="calculator">4.5 + 0.4</gadget>
<output>4.9</output>

<gadget id="calculator">4.9 * 1.5</gadget>
<output>7.35</output>

<result>7.35</result>