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Here is the long form:

FV = (CF/r){[(1 + r)^n]-1}

FV = Future Value of the Cash Flow
CF = Monthly Cash Flow
r= Monthly Interest Rate
n= Number of Months

In your example the cash flow is $1000 per month, r is .0425/12=.00354,
and n is 12:

FV = (1000/.00354)([1.00354]^12 - 1)= (282,485)(.0433) = $12,231

Since you deposited $12,000 over the year, the total interest is


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