I found the formula for present value from this web site: http://www.financeformulas.net/Net_Present_Value.html The code I wrote for this function is as follows:

```
#include <stdio.h>
#include <math.h>
int
main ()
{
int timelength = 40;
int t = 1;
double r;
printf ("Net Present Value.\n");
for (t = 4; t < 26; t++)
printf ("\t%d%%", t);
printf ("\n");
for (t = 1; t <= timelength; t++)
{
printf ("%d\t", t);
for (r = 4; r < 26; r++)
printf ("%f\t", 1 / pow (1.0 + r / 100, t));
printf ("\n");
}
}
```

` `

to compile this you need to use the -lm flag
` `

```
gcc -lm filename.c -o npv
```

The output is tab separated and can easily be imported into a spreed sheet program and formatted.We also had a table to calculate the future return on an Annuity, and I found the way to calculate the table with the formula on this page: http://www.financeformulas.net/Present_Value_of_Annuity.html

```
#include <stdio.h>
#include <math.h>
int
main ()
{
int timelength = 40;
int t = 1;
double r;
printf ("Present Value of an Annuity.\n");
for (t = 4; t < 26; t++)
printf ("\t%d%%", t);
printf ("\n");
for (t = 1; t <= timelength; t++)
{
printf ("%d\t", t);
for (r = 4; r < 26; r++)
printf ("%f\t", (1 - pow (1.0 + r / 100, -t)) / (r / 100));
printf ("\n");
}
}
```

to compile this you need to use the -lm flag
` `

```
gcc -lm filename.c -o apv
```

The text output that this generates looks like:
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