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Clearing The Financial Registers; Simple Interest Calculations - HP 12C Platinum User Manual

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Section 3: Basic Financial Functions

Clearing the Financial Registers

Every financial function uses numbers stored in several of the financial registers.
Before beginning a new financial calculation, it is good practice to clear all of the
financial registers by pressing fCLEARG. Frequently, however, you may want
to repeat a calculation after changing a number in only one of the financial
registers. To do so, do not press fCLEARG; instead, simply store the new
number in the register. The numbers in the other financial registers remain
The financial registers are also cleared when you press fCLEARH and when
Continuous Memory is reset (as described on page 86).

Simple Interest Calculations

The hp 12c platinum simultaneously calculates simple interest on both a 360-day
basis and a 365-day basis. You can display either one, as described below.
Furthermore, with the accrued interest in the display, you can calculate the total
amount (principal plus accrued interest) by pressing + in RPN mode or
+~} in ALG mode.
1. Key in or calculate the number of days, then press n.
2. Key in the annual interest rate, then press ¼.
3. Key in the principal amount, then press Þ$.
4. Press fÏ to calculate and display the interest accrued on a 360-day
5. If you want to display the interest accrued on a 365-day basis, press
6. In RPN mode, press + or in ALG mode, press +~} to calculate the
total of the principal and the accrued interest shown in the display.
The quantities n, i, and PV can be entered in any order.
Pressing the $ key stores the principal amount in the PV register, which then contains the
present value of the amount on which interest will accrue. The Þ key is pressed first to
change the sign of the principal amount before storing it in the PV register. This is required by
the cash flow sign convention (see page 46), which is applicable primarily to compound
interest calculations.


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