How many meters is 50% of 3 kilometers?
3千米的50%是多少米．
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 * (1/2) * 1_000</gadget>
<output>1_500</output>

<result>1_500</result>