A supermarket sells rice at 1.4 yuan per 500 grams, and grandma bought 6.4 kilograms, how much should I pay.
某超市出售大米，每500克1.4元，奶奶买了6.4千克，应付多少元．
<gadget id="calculator">6.4 * 1_000</gadget>
<output>6_400</output>

<gadget id="calculator">6_400 / 500</gadget>
<output>64/5 = around 12.8</output>

<gadget id="calculator">(64/5) * 1.4</gadget>
<output>17.92</output>

<result>17.92</result>