Of the families in City X in 1994, 40 percent owned a personal computer. The number of families in City X owning a computer in 1998 was 30 percent greater than it was in 1994, and the total number of families in City X was 4 percent greater in 1998 than it was in 1994. What percent of the families in City X owned a personal computer in 1998?
50%
52%
56%
70%
74%
the total number of families in City X was 4 percent greater in 1998 than it was in 1994. the total number
比1994的人数多30%,设1994总人数t 40%t拥有电脑人数, 40%t*(100%+30%)=52%t 1998拥有电脑人数 52%t/(100%+4%)t=50%
我没错哈 我就是提醒一下大家 : A is 30% greater than B 等于: A = 30%B + 100% B
增长除以人数
(40% * 1.3)/ ( 1 + 4% )