The following equation (revised Aug. 2005) will provide the TI-85 (and TI-86) with financial capabilities. When it is entered, it will be stored for future use. (The zero coefficient of PMT forces the calculator to display the variables in a different order.)

- FINAN=-PV+0*PMT-FV-((1+.01*IY/PY)^N-1)(PV+100*PMT(PY+.01*DUE*IY)/IY)

**Financial Variables**-
N, number of periods

IY, rate of interest per year -
PY, periods per year

PMT, payment per period

PV, present value

FV, future value **Conventions**-
Payments which increase the balance are positive numbers.

Payments which decrease the balance are negative numbers.

Future values are withdrawals, usually entered as negative numbers.

**Floating Decimal**- Press 2nd MODE, place the cursor on Float, press ENTER, press CLEAR.
**Financial Mode**- Press 2nd SOLVER CLEAR, press the F key corresponding to FINAN, then press ENTER.
**Clearing Financial Data**- Move the cursor to the appropriate variable and enter zero.
**Beginning Annuities**- Move the cursor to DUE and enter a value of 1.

**Entering Financial Data**- Move the cursor to the appropriate variable and enter the value.
**Computing Values**-
Move the cursor to the appropriate variable and press F5 (to solve).
**Example:**-
Tom's account begins with $500, and earns 6% per year, compounded
monthly. He deposits an additional $50 at the end of each month. What
will the balance be at the end of one year?
The variables are:

N = 12 I = 6/12 = 0.5 PMT = 50 increasing PV = 500 FV = ??? - To begin, the keystrokes are:
- 2nd SOLVER CLEAR
- Press the F key corresponding to the program FINAN
- ENTER
- Then for each variable, enter the following value and press ENTER:
- exp = 0

PV = 500

PMT = 50

FV =

IY = 6 - PY = 12

N = 12

DUE = 0

bound = {-1E99, 1E99} - Then move the cursor to FV, and press F5.

The answer is $1,147.62, rounded to the nearest cent.