How to solve basic finance probs?

If Jack sold a stock for $28654 (net) that cost him $22633 five years ago, what annual compound rate of return did Jack make on his investment?

How long will it take to double an investment if it's placed in an account paying 3.6% compounded monthly? Round your answer to the nearest tenth of a year.

What annual rate of interest compounded annually is required to double an investment is 5 years?

I think you have to use logarithms to solve these kinds of problems..and I dont know how to do that.. I can do the rest of basic finance. Pointers please?

1. 4.8307%
2. 19.3 yrs
3. 14.87%

You dont need logarithms. Its all NPV. You're just having to solve for different things. You could use the TVM in solver in a TI-83 calculator...I used Excel.

Proof of answers:

1. 28,654 = 22,633*(1.048307^5)

2. 2,001 = 1,000*(1+(0.036/12))^(19.3*12) This one is off a bit because I rounded...but its showing the investment going from $1,000 to $2,000.

3. 2,000 = 1,000*(1.1487^5)

Hope this helps!

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