The number A is 80% of the number B, and the number B is (1/2) of the number C, so how much is the number A equal to the number C
甲数是乙数的80%，乙数是丙数的(1/2)，则甲数是丙数的多少
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">100 * (4/5)</gadget>
<output>80</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">100 / (1/2)</gadget>
<output>200</output>

<gadget id="calculator">80 / 200</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(2/5) * 1</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>