HP Forums / HP Calculators (and very old HP Computers) / General Forum v / Solving the TVM equation for the interest rate

Post Reply 
Solving the TVM equation for the interest rate
02-13-2020, 10:42 AM (This post was last modified: 02-13-2020 10:46 AM by Gamo.)
Post: #25
Gamo Offline
Senior Member
 		Posts: 729
Joined: Dec 2016
RE: Solving the TVM equation for the interest rate
From HP-55 Mathematics Programs

The Suggested Guess for

1. Direct Reduction Loan Interest Rate with known [n, PV and PMT]
2. Sinking Fund Interest Rate with known [n, FV and PMT]

To find the guess the HP-55 programs book used these formulas.

1. Direct Reduction Loan Interest Rate

[1 / (PV / PMT)] - [(1 / n^2) x (PV / PMT)]

2. Sinking Fund Interest Rate

[((FV/PMT) - n) x 2] ÷ [(n - 1)^2 + (FV/PMT)]

Gamo 2/2020
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
RE: Solving the TVM equation for the interest rate - Gamo - 02-13-2020 10:42 AM



User(s) browsing this thread: 1 Guest(s)

Contact Us | The Museum of HP Calculators | Return to Top | Return to Content | Lite (Archive) Mode | RSS Syndication