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I cant seem solve the following problem due to my bad memory of logarithms

if someone opens an account with initial balance of $B$ interest rate of $R$ and does a constant monthly deposit of $D$

how long before the account balance reaches $X$ ?

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    Do you have a formula for the amount in the account as a function of time?2011-04-21
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    Can you please elaborate: do the deposits begin immediately? Do you have knowledge of the formula for the accumulated/present value of an annuity? Is R the effective rate of interest per month? This seems like a rather difficult problem for those who can't recall log rules (http://en.wikipedia.org/wiki/Logarithm#Logarithmic_identities)2011-04-21

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