Principles of Finance with Excel, 2 nd edition Instructor materials Chapter 3 What does it cost? Understanding IRR.

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Principles of Finance with Excel, 2 nd edition Instructor materials Chapter 3 What does it cost? Understanding IRR

Interest rate often used as a cost  “My mortgage costs 12.2%”  I pay 18.1% on unpaid credit card balances  This chapter:  Use IRR as a cost  Do this intelligently 2

EAIR  “Effective Annual Interest Rate”  EAIR: IRR calculated on annual basis, taking account of all relevant costs  Not to be confused with “annual percentage rate” (APR).  APR is a confusing concept with no well- defined meaning 3

Be careful! Example 1  You’re considering a loan from either West Hampton Bank or East Hampton Bank  West Hampton charges 8%  East Hampton charges 6%. BUT they have a “loan initiation charge” of 4%  Which is cheaper? 4

West Hampton is cheaper 5

Be careful! Example 2  Loan Shark Inc. charges 14.4% interest on a monthly basis. When you ask them: this means 14.4%/12 = 1.2% per month.  Is Loan Shark cheaper than your bank, which charges 15% annually? 6

Loan Shark is more expensive! 7

Be careful! Example 3  You’re buying a Junkmobile for $2,000.  You don’t have any money.  Dealer offers two options:  Pay cash, get 15% discount  “Zero percent financing”: Pay nothing today, pay full price of $2,000 in one year  Uncle Frank will loan you money for 10%. 8

9 Dealer’s “0% financing” is really 17.65%! You’re better off paying cash to the dealer and borrowing the $1,700 from Uncle Frank at 10%.

Cost of a mortgage  Simple mortgage:  Borrow $100,000 for 10 years, 8% interest  Annual payments  PMT will compute the payment 10

Mortgage (continued) 11 PMT function: We put in PV as a negative number in order to get a positive mortgage payment. (This was discussed in Chapter 2.)

Mortgage with points  Same story as before: $100,000 mortgage, 10 years, 8% interest.  But: Bank charges “1.5 points.” This means they give you only $98,500, but charge you as if you’ve borrowed $100,

Computing EAIR on mortgage with points 13

Mortgage amortization table 14 The table splits each payment of $14, into interest and return of principal.  Interest = 8.34%*Principal at beginning of year  Repayment of principal = Payment ($14,902.95) – Interest You can see that at 10 years the mortgage is repaid.

Excel functions PPMT and IPMT  Compute directly the principal and interest portions of the annual payment  Work like PMT. 15

16

Longer-term mortgages  30-year mortgage, $100,000 principal  8% interest, computed monthly (meaning 8%/12 = % per month)  Points: 1; “origination fee” = 0.5%  Meaning: You get $98,500, but are charged as if you borrowed $100,000 17

30-year mortgage 18 Note use of Rate to compute EAIR (next slide).

Excel function Rate 19 Rate computes the IRR for constant payments. In this example: 360 monthly payment of $ against an initial loan of $98,500: Rate gives the monthly IRR at 6.799%. Rate is preferable to IRR when there are many payments and they are constant.

Lease vs purchase  Common financial problem  In this simple example:  Buy computer for $4,000  Lease it for 3 years for $1,500 annually.  Catch: You pay $1,500 now and $1,500 at the end of years 1, 2, 3  To compute the cost of the lease, use the differential cash flows (next slide)  The differential cash flows show that lease is like borrowing $2,500 with payments of $1,500 in years 1, 2, 3 20

21 The example assumes that you can borrow at 15% from the bank. Cell D13 decides lease or purchase depending on which is cheaper. Payments on bank loan are cheaper, same amount borrowed!

Auto lease 22

Advanced topic: More frequent compounding THE FOLLOWING IS TAKEN FROM THE WEBSITE OF CITIBANK (South Dakota). It describes the interest rate (APR = “annual percentage rate”) on credit cards. Variable APRs Based on Prime. If any APR is based on the U.S. Prime Rate ("Prime Rate"), the APR will equal the Prime Rate plus an additional amount. If the Prime Rate increases, it will cause the APR to increase. If the Prime Rate decreases, it will cause the APR to decrease. For each billing period we use the Prime Rate published in The Wall Street Journal two business days before the Statement Closing Date. If the Prime Rate causes an APR to change, we put the new APR into effect as of the first day of the billing period for which we calculate the APR. We apply the new APR to any existing balances, subject to any promotional rate that may apply. If The Wall Street Journal does not publish the Prime Rate, we will use a similar published rate app=UNSOL&siteId=AC&langId=EN&BUS_TYP_CD=CONSUMER&DOWNSELL_LEVEL=0&BALCON_SC= &B=M&DOWNSELL_BRANDS=&t=&uc= Very difficult to understand!

Citibank goes on to say  APR for Purchases. There is a standard purchase APR. It equals the Prime Rate plus 9.74%. As of 09/01/2010 this APR is 12.99%. This APR equals a daily periodic rate of %.  APR for Cash Advances. There is a standard cash advance APR. It equals the Prime Rate plus 21.99%. As of 09/01/2010, this APR is 25.24%. This APR equals a daily periodic rate of %. 24

What does this mean? 25 The APR understates dramatically the actual interest cost. The effective annual interest rate on purchases is % and not the APR of 12.99%; on cash advances 28.7% and not the APR of 25.24%. Shame on you Citibank!

What is the effective annual interest rate (EAIR) 26 Continuous compounding can simplify the computations of EAIR when the compounding periods are very short. In this example: daily compounding.

Homework Citibank states: The Penalty APR is the Prime Rate plus up to 26.74%. As of 09/01/2010, the highest Penalty APR is 29.99%. This equals a daily periodic rate of %. We set your Penalty APR based on your creditworthiness.  Question: How much is the EAIR for the “Penalty APR” of 29.99%? 27