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276 F: RPN: Selected Examples
File name : English-M02-1-040308(Print).doc Print data : 2004/3/9
F
RPN: Selected Examples
The following examples selected from chapter 14 (“Additional
Examples”) have been converted to RPN keystrokes. These examples
illustrate how to convert algebraic to RPN keystrokes in less common
situations: with
%
, with
R
, and in a CFLO list.
Example: Simple Interest at an Annual Rate. Your good friend needs a
loan to start her latest enterprise and has requested that you lend her
$450 for 60 days. You lend her the money at 7% simple annual interest,
to be calculated on a 365-day basis. How much interest will she owe
you in 60 days, and what is the total amount owed
?
Keys: Display: Description:
450
E
7
%
Annual interest.
60
*
365
/
Actual interest for 60
days.
450
+
Adds principal to get
total debt.
Example: APR for a Loan with Fees. A borrower is charged two points
for the issuance of a mortgage. (One point is equal to 1% of the
mortgage amount.) If the mortgage amount is $60,000 for 30 years
and the interest rate is 11½% annually with monthly payments, what
APR is the borrower paying
?
1. Since the payment amount is not given, calculate it (PMT) first. Use the
given mortgage amount (PV = $60,000) and interest rate (I%YR =
11½%).
2. To find the APR (the new I%YR), use the PMT calculated in step 1 and