Hello, I have one question, if you are not suppose to use your first equation, how do you know 1.05 = e^k?

I am only comparing the compound interest equation with the equation given in the question, which is required to get the value of the constant k. I did not use the compound interest equation to calculate the principal value.

I see. Anyway, the answer key does not give your answer. Anyway question a bit funny. Thanks for responding