2.1 Subtract 0.18 from the quotient of dividing 8.4, and multiply the difference by 30 times. What is the result?
2.1除8.4的商减去0.18，再把所得的差扩大30倍，结果是多少？
<gadget id="calculator">8.4 / 2.1</gadget>
<output>4</output>

<gadget id="calculator">4 - 0.18</gadget>
<output>3.82</output>

<gadget id="calculator">3.82 * 30</gadget>
<output>114.6</output>

<result>114.6</result>