GWD 18-30

[csc]

GWD 18-30

From May 1 to May 30 in the same year, the balance in a checking account increased. What was the balance in the checking account on May 30 ?
(1) If, during this period of time, the increase in the balance in the checking account had been 12 percent, then the balance in the account on May 30 would have been $504.
(2) During this period of time, the increase in the balance in the checking account was 8 percent.

答案是C，我選A，為何A不充分，請各位指導

[waleaaa]

條件(1)只說當餘額增加12%時，期末餘額會是$504～
雖可推算期初餘額，但未提及實際本月的增加率為何～
故條件(1)不充分～

[csc]

條件(1)只說當餘額增加12%時，期末餘額會是$504～
雖可推算期初餘額，但未提及實際本月的增加率為何～
故條件(1)不充分～

感謝waleaaa如此快速的回應，我可以理解你的意思，我想是我誤會題目的意思，誤將若增加12%想成本月增加12%