Question

At the beginning of each year for 14 years, Sherry Kardell invested $400 that earns 10% annually. What is the future value of Sherry's account in 14 years?
A. $14,000 B. $13,100 C. $12,309 D. $12,709

Answer: D?
I've calculated several times and come out with C or D please help!
400*1.1^14 + ... + 400*1.1^1
= 400(1.1^15-1)/(1.1-1)
= 12709
D12.709

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