请教一道数学题~~大虾帮帮忙拉!!!

xiangmingliu08

Beginning in January of last year, Carl made deposits of $120 into his account on the 15th of each month for several consecutive months and then made withdrawals of $50 from the account on the 15th of each of remaining months of last year. There were no other transations in the account last year. If the closing balance of Carl's account for May of last year was $2,600, what was the range of the monthly closing balance of Carl's account last year?

(a) Last year the closing balance of Carl's account for April was less than $2,625.
(b) Last year the closing balance of Carl's account for June was less than $2,675.

这是一道Data efficiency 题，题意我还不太明白，希望大虾解题的时候解释得清楚一点，叩谢拉~~~！！！

hxc19890912

哎呀！我也是这道题有问题呀！！！！

serenashu

同问，帮顶~~~

gilgemash

http://www.beatthegmat.com/og12-question-t38374.html

gkast

从去年一月开始，Carl 连续数月的15号存$120进户口，然后在去年剩余的月份每月的15号提$50。除此以外户口没有动过。如果去年五月份户口结算额是$2600，那么去年月份最高结算额和月份最低结算额差多少 (range)?

1) 去年四月结算额少于$2625
2) 去年六月结算额少于$2675

题翻译了应该不难解吧。