Texas Instruments BA-35 Quick Reference Guide - Page 18

Annuity Calculations For annuity calculations, use 2 to set the calculator to financial mode (FIN appears in the display). An annuity is a series of equal payments made at regular time periods with interest calculated at the end of each period. Ordinary annuities have end-of-period payments; annuities due have beginning-of-period payments. 0 a (Beginning-of-Period)-Sets the calculator to compute for annuity-due problems (beginning-of-period payments). Pressing 0 a causes Begin to appear in the display. The beginning-of-period function is in effect until you cancel it (by pressing 0 a again) or leave the financial mode. § When Begin is in the display, the calculator solves using beginning-of-period payments. § When Begin is not in the display, the calculator solves using end-of-period payments. Note: If an annuity problem does not use beginning-of-period payments, be sure that Begin is not in the display before you compute the answer. Having Begin in the display has no effect on compound interest calculations in which no payment is involved. 18