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Logarithmic Functions

Logarithmic Functions
Project description
MATH233 Unit 4: Logarithmic Functions
Discussion Board Assignment: Version 2A
Note: All work must be shown and explained to receive full credit.
The equation to simulate the time that it will take for an investment to grow based on the interest rate,
compounded monthly, is as follows:
????(????) = ln(????)
12 ln(1+0.0833????) ???? 0
where T is the time in years, r is the interest rate (in decimal form), and k represents the growth of the
investment.
1. Choose a value for k from the table based on the first letter of your last name for the investment
that you want to simulate, and set up your equation for T(r). Choose a value of k that is different
from your classmates values of k.
First letter of your last name Values for k Interpretation
AF 1.101.90 Investment will grow 1.10 to 1.90 times
GL 2.102.90 Investment will grow 2.10 to 2.90 times
MR 3.103.90 Investment will grow 3.10 to 3.90 times
SZ 4.104.90 Investment will grow 4.10 to 4.90 times
2. Find the derivative of T(r) with respect to r, the rate of change in time with respect to the interest
rate using the quotient rule. (Note that ln(k) is a constant.)
3. Choose 5 interest rates between 2% and 20%. Complete the following table by calculating the
values of T(r) and T(r), correctly rounded to two decimal places. (Note that the rates do not
necessarily have to be whole numbers. Examples such as 5.5% or 9.85% are acceptable.)
Interest Rates, r T(r) T(r)Page 2 of 3
4. What can you say about the values that you calculated with the interest rates that you have
chosen?
5. Show that your interpretation is correct by sketching the graph of T(r) and T(r) using Excel or
another graphing utility. (If necessary, the graphs may be pasted into a Word document and
attached to the DB thread.)
6. Compare your calculations to any of your classmates. Explain how different values for k and r
affect your calculations.
7. Which intellipath Learning Nodes helped you with this assignment?
The following are the steps to derive the formula in this assignment from the formula for compounding
interest at discrete periods of time, ???? = ????(1 + ????
????
)????????, where A is the future amount, P is the principal, r is
the decimal equivalent of the annual interest rate, n is the number of times compounded in 1 year, and t is
the total time in years.
???? = ????(1 + 1
12 ????)12????
????
???? = (1 + 0.0833????)12????
ln
????
????
= ln(1 + 0.0833????)12????
ln
????
????
= 12???? ln(1 + 0.0833????)
???? = ln
????
????
12ln(1 + 0.0833????)
Let ???? = ????
????
, the ratio of the ending amount to the beginning amoutn, and replace t by T(r) to indicate that
this is a function of the decimal equivalent of the annual interest rate, r. Then, we get the following
formula:
????(????) = ln(????)
12 ln(1 + 0.0833????)
Notice that, from the derivation above, if the compounding is quarterly, the formula would be as follows:Page 3 of 3
????(????) = ln(????)
4 ln(1 + 0.025????)
Compounding daily would be as follows:
????(????) = ln(????)
365 ln(1 + 0.00274????)
Compounding annually would be as follows:
????(????) = ln(????)
ln(1 + ????)
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