need help 十月JJ, 谢谢

kay

这几道题很是不明白, 谢谢高手帮助! 请给我讲一下解题思路好吗? 1.Some city in 1984. 40% population own computers. In 1990, the population owns computers increased 30% (Which means 40% of P), while the total population(which means the total P in 1984) increased 4%. What is the percentage of population who own computers? 2.DS: 45% the apartments with <=3 people living in each one. What’s the median? (1)80% of the apartments have <=5 (2)35% of the apartments have >=5 ###(C) Note: Median is 4