A residential building has 8 floors and 12 households on each floor. On average, each household uses 15 tons of tap water per month. How many tons of water does this residential building use per month?
一栋住宅楼，共有8层，每层有12户居民．平均每户每月用自来水15吨．这栋居民楼每月用水多少吨？
<gadget id="calculator">12 * 8 * 15</gadget>
<output>1_440</output>

<result>1_440</result>