A bag of washing powder weighs 800 grams, what is the total weight of 5 bags of such washing powder in kilograms?
一袋洗衣粉重800克，5袋这样的洗衣粉一共重多少千克．
<gadget id="calculator">5 / 1_000</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">800 * (1/200)</gadget>
<output>4</output>

<result>4</result>