Voluntary blood donors generally donate 200 ml of blood each time, and a total of 220 people participate in voluntary blood donation on a certain day. How many liters of blood was donated?
义务献血者每人每次献血一般为200毫升，某一天一共有220人参加义务献血．共献血多少升？
<gadget id="calculator">200 * 220</gadget>
<output>44_000</output>

<gadget id="calculator">44_000 / 1_000</gadget>
<output>44</output>

<result>44</result>