randRange(300,500) randRange(601,750) randRange(1,5) randRange(1,9) TIME_YR + TIME_DEC/10 roundTo(4,(Math.log(VALUE_FINAL/VALUE_INITIAL))/TIME)

This exercise will help you to attain fluent use of the growth concept of using euler's number.

An inital investment of $VALUE_INITIAL yields $VALUE_FINAL after TIME years?
What was the growth rate expressed as a decimal?

RATE

Remember Euler's number (e) is about growth

and the inverse operation natural log (ln) is about time
....or rate*time to be more exact.

Figure out the ratio of the Final Value to the Initial Value...take the Natural Log and divide by the time

This will give you the rate which you are to provide as a decimal to 4 places.

RATE is the correct answer.