View
304
Download
0
Embed Size (px)
Citation preview
Objective: calculate simple and compound interest
Find each amount.
1. 6% of $400
2. 4.5% of $700
3. 5.5% of $325
Bellwork
Solve for p.
4. I = prt
5. 3p + 4 = k
principal - money first deposited
interest - money you earn on principal
interest rate -
simple interest - only paid on principal
Simple Interest Formula
I = prt
Suppose you deposit $400 in a savings account. The interest rate is 5% per year.
Find the simple interest earned in six years. Find the total of principal plus interest.
Find the interest earned in three months. Find the total principal plus interest.
Compound interest - when a bank pays interest on the principal and on the interest an account has earned.
You deposit $400 in an account that earns 5% interest compounded annually. What is the balance in your account after 4 years? In your last calculation, round to the nearest cent.
Principal at Beginning of Year Interest BalanceYear 1
Year 2
Year 3
Year 4
Compound-Interest Formula
B = p(1 + r)n
finalbalance
principal
interestrate
number of interest periods
Find the balance on a deposit of $1,000 that earns 6% interest compounded semiannually for 5 years.
Find the balance for each account.Amount deposited: $900, annual interest: 2%, time: 3 years
a) compounded annually
b) compounded semiannually
HW pg. 385 # 1-15 odd