loan calculation applet code

I am trying to code a java applet to calculate the loan with interest. i would appreciate any help i can get with this little project.

maximun loan is annual incom*3.
subjected to a maximum of USD 1500000 or 85% of item amount which ever is less
max tenure is 7 years, minimun eligibility criteria would be that annual income should not be less than USD 100000,
person age should be 21 to 60.

If you need our help, you need to tell us exactly what you need help with. So far all I see are some requirements but no real question. Exactly what step are you stuck on?