Approximate: log5 47 to the nearest ten thousandth.
(I put 2.3922 but that is incorrect)
Approximate: log12 5 to the nearest ten thousandth.
(I put 0.6477 but that is incorrect)

i think you would have to divide the money he had saved, which is $2,000 by the time he plans on exercising which is 40 hours, and the answer you get should tell you the answer to your question.