refresher stuff

[Sophiesmark]

So I guess Im doing good cuz I only got stuck on 3 out of 28 problems.....
can anyone give me a refresher in investing stuff though, i remember seeing this a long time ago but I dont remember how to do it.
here's one of the probs:
If $R is invested in an account that yields 6% compounded monthly, then the principal after t years is P=R(1+.06/12)^12t

Find the average rate of returnfor one yr. assume R=1. COmpute derivative of P with respect to t (express answer without approximating any logs). FInd aprox value of derivative after one yr, R=1 still

As a side note what does it mean exactly when they say "with respect to"?

 

[Sophiesmark]

So , I came up with P= .0022, but that isnt the same answer as the book has

 

[stapel]

We'll be glad to check your work, but you'll need to post it first.

Thank you.

Eliz.