Finding the total of compound interests

IBstudent

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Joined
Jan 27, 2012
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math problem.jpg
Hi all!

Attached is a problem I couldn't solve, I hope someone could help me with it...

I solved part a correctly, however, would I substituted the values in part b to the formula I was taught (see attachment), I got a wrong answer! The answer should be [1000(1.075)([1.075^10] -1)] /[1.075-1].
Why the additional (1.075)???

I am officially confused :S

I would appreciate any help...

Thanks in advance.
 
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