Is the calculator suppossed to have "DEG" in the bottom right hand corner? I am trying to enter the numbers for the compound interest formula and I keep getting "Syntax Error" Is it because of the "DEG" mode? Or is this mode the default setting? How do you remove the "DEG" mode?

Assuming you are already familiar with the functions of your calculator computing compound interest is a formula in and of itself. Look at this link to the video on computing compound interest. https://www.youtube.com/watch?v=dwb3hGla4qw
Buy the way, computing compound interest is easier with a financial calculator like the HP12C
using the Solver you can enter in the equation if you know it.

Fixed deposit calculations can be done by both manual and automatic methods.Now let us figure out the fd calculation in both ways:
1.) Manual Calculation Technique: It is the conventional process to know your Fixed deposit interest calculation. The formula for manual fd calculation is used as below:

Where,A = Final Amount
P = Principal Amount (initial investment)
r = Annual Nominal Interest Rate (as a decimal, not in percentage)
n = Number of times the interest is compounded per year
t = Number of years

2.) Online Calculator Technique: Nowadays online FD calculator is very amazing technique and it is a very useful online tool that helps you to easily calculate your Fixed deposit return. Online FD calculators uses simple technique in which you need to put your amount, tenure, interest rate and can get accurate results instantly. You can easily calculate and compare the interest receivable by changing the deposit amount.

There is no such button. You must figure out the formula and enter it, giving the appropriate value for the annual interest and the number of years (15).

Just tell us what formula you must enter and we will show you how to enter it.

This indicates that compound interest will be applied to the odd period (for cases when n is not an integer). To use simple interest (and turn off the indicator), press STO EEX.

It indicates that the calculator is set for compound interest on the odd period instead of simple interest. To toggle this setting press STO EEX.

Various formulas for calculating interests exist. Make sure you are using the correct one. If a C appears on the bottom of the screen and to the right, the interests are compounded. If No C is displayed the interests are simple. That could explain the discrepancies.

Yes you can use it, here is the formula: Y= V(t+ (i/c))^(tc) V=amount put in, t=time, i=intrest rate, c= amount of times it is compounded.
(I know this because I have a TI-83 calculator)

=10000*(1+0.96)^12
=10000*(1+0.10)^18
=10000*(1+0.10)^24