学帮网Gmat Data Sufficiency "the range of the monthly closing balance"如何理解?eg.Beginning in January of last year,Carl made deposits of USD120 into his account on th 15th of each month for several consecutive months and then made withdrawals of USD50
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Gmat Data Sufficiency
"the range of the monthly closing balance"如何理解?
eg.Beginning in January of last year,Carl made deposits of USD120 into his account on th 15th of each month for several consecutive months and then made withdrawals of USD50 from the account on the 15th of each of the remaining months of last year.There were no other transactions in the account last year.if the closing balance of Carl;s account for May of last year was USD2600,what was the range of the monthly closing balances of Carl's account last year?
(1)Last year the closing balance of Carl's account for Apr was less than USD2625.
(2)Last year the closing balance of Carl's account for Jun was less than USD2675.
Answer:C
最好能翻译并给出中文详细解答.
the range of the monthly closing balances 月结算余额的范围
题目的意思是 从去年1月开始C每个月15号向账户中存入150刀,连续存N个月；然后从N+1月开始到12月每个月取出50刀.现在一直去年5月的月结算余额是2600刀,问去年一年的月结算余额范围是多少?
要得到这个答案,就必须知道两点：N的确定值和账户中原来就有的金额A.
这两点确定了则每个月的余额都能计算出来,那么范围就出来了.所以这道题的实质是要确定N与A为多少.
由已知条件得：
若N>=5, 5*120+A=2600
若N