Compounded (Compounded Semi-Annually Quarterly …
Compound Interest
Imagine that your Gramma gives you $100 for your birthday in December. You decide to research different ways to start
a savings plan that will help you make the most of your gift. You find a savings plan that pays 8% interest annually.
Piggy Bank
Simple Interest
(Compounded
Annually)
Compounded
Semi-Annually
Compounded
Quarterly
Balance on 1/1
Balance on 4/1
Balance on 7/1
Balance on 10/1
Balance on 12/31
Compound Interest Formula
Using the formula above, fill out the table below to show how much money would be in your account at the end of 20
years if your account pays 5% per year and is compounded as shown in the table.
Compounded
Annually
Compounded
Semi-Annually
Compounded
Quarterly
Compounded
Monthly
Compounded Daily
Natural Base
Consider an investment of $1 in an account that pays 100% annual interest. Write a formula for the amount in the
account after 1 year for n compounding per year.
Find the value of the account for the number of compounding per year that are given in the table below.
Number of
Compoundings
Per Year (n)
1
10
100
1000
10,000
100,000
1,000,000
Value in Account after 1 Year
Natural Base e
Compounding Continuously Formula
Compare the amount of money in two savings accounts after 25 years with the same initial investment of $500 and
interest rate of 6% if the first account is compounded monthly and the second is compounded continuously.
Compounded Monthly
Compounded Continuously
Graphing ? ? = ??
'~
x
-2
-1
0
1
2
? ? = ??
List 3 features of the graph that are the same as other exponential graphs (with different bases).
Compound Interest Worksheet
1. Find the amount of money in an account after 15 years if $7000 is deposited at 6% annual interest compounded as
follows.
Annually
Semi-Annually
Quarterly
Daily
Continuously
2. How much money will be in an account at the end of 34 years if $17,000 is deposited at 12% annual interest
compounded as follows?
Annually
Semi-Annually
Quarterly
Daily
3. Fill in the table for each of the given functions. Then graph each function on the same axes.
al
f(x) = 2z
-2
-1
--~----~--'
'
.. -~----~--: :
0
--~----~---
X
I
I
1
2
b)
X
g(x) = 4r
'
:'
I
'
''
''
'
'
--~----~--... _ .. _ _ _ _ 1,. __ _
I
'
' '
'' ''
--1.----L.--I
I
I
:
:
0
I
--~----~---
1
2
I
'
:'
:'
--t.----~---
:
c)
-2
-1
0
1
2
I
:'
--L----L--: :
-2
-1
X
'
'
I
h(x) = ez
'
:
I
'
Continuously
................
................
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