Voluntary blood donors generally donate 200 ml of blood each time. According to this calculation, a total of 150 people from a certain unit participated in voluntary blood donation on Sunday, how many liters of blood were donated in total?
义务献血者每次献血量一般为200毫升．照这样计算，星期天某单位共有150人参加义务献血，大约共献血多少升？
<gadget id="calculator">200 * 150</gadget>
<output>30_000</output>

<gadget id="calculator">30_000 / 1_000</gadget>
<output>30</output>

<result>30</result>