A - Balance

[ve_boss]

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.

[Dynamo]

IMO C

Statement 1

you can calculate the amount in the beginning of the month but you no rate is given so INSUFF

statement 2

you have the percent rate increase but you know nothing about the intial amount so.....INSUFF

both combined you have the two info required the intial value and the ROI so you can calc the balance at the end of the month.

[bose]

surely C, st 1 gives value on May1st, st2 give increase rate, both required so C