OG12数学题求解

tracychou114

各位nn
OG12 中第一道数学题就错了。。可是看了答案也没有懂。。
Last month a certain music club offered a discount to
preferred customers. After the first compact disc
purchased, preferred customers paid $3.99 for each
additional compact disc purchased. If a preferred
customer purchased a total of 6 compact discs and
paid $15.95 for the first compact disc, then the dollar
amount that the customer paid for the 6 compact
discs is equivalent to which of the following?
(A) 5(4.00) + 15.90
(B) 5(4.00) + 15.95
(C) 5(4.00) + 16.00
(D) 5(4.00 – 0.01) + 15.90
(E) 5(4.00 – 0.05) + 15.95
答案不是应该是5(3.99) + 15.95   为什么会选A？？？？？

serenashu

楼主你的答案是对的，你跟A的写法不一样而已~~

tracychou114

对哟。。我傻了。。哎。。对了。。问一句哟。。gmat考试的时候可以用计算器吗？

good白

5（3.99）+15.95=5*3.99+15.90+0.05=5*3.99+5*0.01+15.90=5（4.00）+15.90