Thursday, November 19, 2009

PS 122

Each month for 6 months the amount of money in a benefit fund is doubled. At the end of the 6 months there is a total of $640 in the fund. How much money was in the fund at the end of 3 months?
(A) $80
(B) $100
(C) $120
(D) $160
(E) $320

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