(1.65*2+1.56*3*(4/5)-(9/50))*0.3/0.5.
(1.65*2+1.56*3*(4/5)-(9/50))*0.3/0.5．
<gadget id="calculator">1.65 * 2</gadget>
<output>3.3</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1.56 * 3 * (4/5)</gadget>
<output>3.744</output>

<gadget id="calculator">9 / 50</gadget>
<output>9/50 = around 0.18</output>

<gadget id="calculator">3.744 - (9/50)</gadget>
<output>3.564</output>

<gadget id="calculator">3.3 + 3.564</gadget>
<output>6.864</output>

<gadget id="calculator">0.3 / 0.5</gadget>
<output>0.6</output>

<gadget id="calculator">6.864 * 0.6</gadget>
<output>4.1184</output>

<result>4.1184</result>