求助新东方小蓝上的一道数学

bubumouse

if an organization were to sell n tickets for a theater production, the total revenue from ticket sales would be 20 percent greater than the total costs of the production. if the organization actrually sold all but 5 percent of the n tickets, the total revenue from ticket sales was what percent greater than the total costs of the production?

a 4%

b 10%

c 14%

d 15%

e 18%

哪位兄弟姐妹能够告诉我这个题怎么得出C这个答案的？

bubumouse

在线等~~~~

pilip

设REVENUE为R，COST为C，根据条件已知R=1。2C；那么R/C=1。2
先求95%R/C为多少，所以就是95%乘上1。2，再减去1，就是最后的14%了

[此贴子已经被作者于2009/8/22 16:15:27编辑过]

bubumouse

明白了 谢谢~~