User manual TEXAS INSTRUMENTS BA-35 SOLAR QUICK REFERENCE

[. . . ] BA-35 Solar Quick Reference Guide Table of Contents General Information . . . . . . . . . . . . . . . . . . . . . . . . . . TI Product Service and Warranty Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 6 7 8 9 10 12 13 14 16 18 23 24 27 30 35 37 38 © 1996 by Texas Instruments Incorporated 1 General Information Turning the Calculator On and Off u (All Clear/On)--Turns on the calculator. This key also clears the display, all pending operations, and values in memory or the mode registers. [. . . ] For example, to recall the value for margin, press s U. 14 Performing Gross Profit Margin Calculations To calculate cost, selling price, or gross profit margin: 1. Press 0 b to clear the registers and use 2 to enter the profit margin mode (no display indicator). Performing Markup Calculations To calculate cost, selling price, or markup: 1. Press 0 b to clear the registers and use 2 to enter the profit margin mode (no display indicator). Press 1 and the key (or key sequence) for the unknown value. 15 Compound Interest Calculations To calculate compound interest, use 2 to set the calculator to the to the financial mode (FIN appears in the display). In compound interest calculations in which no payment is involved, the payment (PMT) is assumed to be zero. When the payment has a value other than zero, the calculator treats the problem as an annuity (a series of regular, equal payments). Compound Interest Keys In compound interest calculations, the following keys are used to enter or calculate the values listed below. With a savings account, for example, PV represents what your money is worth today. With a savings account, for example, FV represents what your money will be worth in the future. 1 (Computation Key)--Computes the unknown value for compound interest problems. 16 Recalling Values To recall a value that you have entered or computed, press s and the appropriate key for the value you want to recall. This value may be positive or negative, depending on the type of problem you are solving (as explained on page 20). With a loan, FV represents any balloon payment that must be made in addition to the last regular payment. § When Begin is not displayed, the 1 key computes the unknown value for ordinary annuities (annuities with end-of-period payments). § When Begin is displayed, the 1 key computes the unknown value for annuities due (annuities with beginning-of-period payments). 19 Annuity Calculations (Continued) Recalling Values To recall a value that you have entered or computed, press s and the appropriate key for the value you want to recall. Positive or Negative Payments In annuity problems, the present value and future value are usually positive numbers. The payment amount may be positive or negative, depending on the type of problem you are solving. § If payments are discounted backward, the payment amount is positive. These problems have a present value, but they may or may not have a future value. (If there is no future value, FV=0. ) § If payments are compounded forward, the payment amount is negative. These problems have a future value, but they may or may not have a present value. [. . . ] An estimated percentage is added to the monthly payment for taxes and insurance. The total monthly payment (principal, interest, taxes, and insurance) is not to exceed a predetermined percentage limit of the buyer's gross monthly income. Values You Supply: § annual interest rate § number of years in mortgage § buyer's gross monthly income § percent limit (of gross monthly income) § percent taxes and Insurance (of total monthly payment) § percent down (of selling price) Procedure Clear calculator and mode registers; select two decimal places. Key Sequence -0b 0c2 2 (continued) 32 Procedure Press 0 a until Begin is not displayed. * Enter monthly interest rate. Calculate and enter maximum allowable loan payment (without taxes or insurance). [. . . ]