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December 13, 2011 3.6 Finance Math Interest Compounded Annually A = P(1 + r)n Interest Compounded k Times per Year r A=P 1+ k kt Interest Compounded Continuously A = Pert December 13, 2011 1. Mike has $600 to invest at 8% annual interest compounded monthly. How long will it take for his investment to grow to $2400? December 13, 2011 2. Sue invests $200 at 7% annual interest compounded continuously. Find the value of her investment at the end of each of the years 1, 2, ... , 7. December 13, 2011 Annual Percentage Yield (APY) the percentage rate that, compounded annually, would yield the same return as the given interest rate with the given compounded period. Tom invests $2000 with Key Bank at 5.15% annual interest compounded quarterly. What is the equivalent APY? December 13, 2011 annuity: sequence of equal periodic payments ordinary: deposits are made at the end of each period at the same time the interest is posted in the account Future Value of an annuity, consisting of n equal periodic payments of R dollars at an interest rate of i per compounding period (payment interval) is: FV = R r k kt (1 + ) - 1 r k December 13, 2011 3. At the end of each quarter, Emily makes a $400 payment into the Smithville Financial Fund. If her investments earn 7.75% annual interest compounded quarterly, what will be the value of Emily's annuity in 25 yrs? December 13, 2011 Present Value of an Annuity consisting of n equal payments of R dollars earning an interest rate i per period (payment interval) is: PV = R 1 - (1+ )-kt r k r k Cindy purchases a new car for $19,000. What are the monthly payments for a 3-year loan with a $3000 down payment if the annual interest rate (APR) is 3.1%