[求助]想请问一题JJ…题目看不懂

3.一个地区的人均ＸＸ是用ＸＸ的总量除以总人口。已经某地区的ＸＸ总量，rounded to the nearest 1,000,000,000 is 43,000,000,000, while the population
of this area, when rounded to the nearest 1,000,000 is 860,000,000. Is 人均ＸＸ
        within $5 of $500 in this area?

题目看不懂 

不知道它要问什么