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Answer
The answer and procedures of the exercise are attached in a microsoft excel document. Last version.
Explanation
Please consider the data provided by the exercise. If you have any question please write me back. All the exercises are solved in a single sheet with the formulas indications.
Answer:
n = ㏒ P ÷ ㏒ (1.08)
Explanation:
Compound interest rate
A = P × 
where
P = principal amount (the initial amount you borrow or deposit)
r = annual rate of interest (as a decimal)
A = amount of money accumulated after n years, including interest.
n = number of years
Since we want the principle amount to double i.e., A = 2P
put this in above equation
2P = P × 
divide both sides by P, we get
P = 
put r = 0.08
P = 
P = 
Taking log on both sides
㏒ P =㏒ 
㏒ P = n ㏒ (1.08)
n = ㏒ P ÷ ㏒ (1.08)