Cristiana uses $25,000 to purchase a 25 month cd (certificate of deposit) that pays 2.47% compounded monthly.
a. what is her investment worth at the end of 25 months?
b. how much interest did she earn?

if you explain the the question more correctly i might be able to answer this better

step-by-step explanation:

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)