Mathematical Formula - Interest Calculation Simple interest is money you can earn by initially investing some money (the principal). A percentage (the interest) of the principal is added to the principal, making your initial investement grow. n = number of compounding periods. i = periodic interest rate, expressed as a decimal. PV = present value. FV = future value or balance. PMT = periodic payment. S = payment mode factor (0 or 1) indicating treatment of PMT.

Mathematical Formula - Percentage Calculation where: % is percentage Δ% is change is percentage T% is Total which is percentage change plus base Try our on-line percentage calculator here!

Mathematical Formula - Financial Calendar Actual Day Basis DYS = f(DT2) ‘“ f(DT1) where: f(DT) = 365 (yyyy) + 31 (mm ‘“ 1) + dd + INTG (z/4) ‘“ x and for mm d 2 x = 0 z = (yyyy) ‘“ 1 for mm > 2 x = INTG (0.4mm + 2.3) z = (yyyy) INTG = Integer portion. Note: Additional tests are performed in order to ensure that the century (but not millennium) years are not considered leap years.

Mathematical Formula - Statistics Statistics - Mean: Statistics - Weighted Mean: Statistics - Linear Estimation: n = number of data pairs Statistics -Standard Deviation: n = number of data pairs

HP MatrixWriter The HP MatrixWriter is a wonderful built-in form to facilitate the entry of matrices. In many ways, this screen works like any spreadsheet. An entered number will go into the highlighted cell. In addition to the spreadsheet format, the HP Matrix Writer provides you with access to many functions for working with matrices. The following HP Calculators have the HP Matrix Writer feature: HP 48gII, HP 49g+ and HP 50g.

HP EquationWriter - HP Exclusive Technology With the HP EquationWriter, you can work through complicated calculations and see the equation take shape before your eyes. The HP EquationWriter displays the evolving calculation in a textbook format, so it is possible to easily compare the display to an equation on paper to ensure proper entry. And, the need to keep track of parentheses is reduced to a minimum. The HP EquationWriter makes it quick and easy to write, edit, and mathematically manipulate formulae that would otherwise be very difficult or even impossible to do from the command line.

Sent: Monday, 10 April, 2006 From: Ray Djajadinata Subject: HP12CP Text: Hi Peter, Thanks for the tips! I’m really happy with my purchase of 12CP–it’s such a powerful little thing. Previously I almost bought the Texas Instrument calculator because of HP’s RPN, but I realized that 12CP does Algebraic model as well. Besides, RPN feels natural just after using the calculator for about 1-2 days of perusing the manual and the calculator :) Warm regards, Ray.

HP Labs honor HP 35 HP Labs - 1966 to 2006. 40th Anniversary - Innovation That Counts. HP 35 Calculator has been honored as 1 of the 40 innovations with impact. Throughout its history, HP Labs has created or contributed significantly to technological innovations that have had a major impact on the industry. Many of these were firsts and unique in their time. In 1972, the first pocket scientific calculator: Engineers rise to Bill Hewlett’s challenge to create a scientific calculator that fits in a shirt pocket.