<iframe src="loan.php"></iframe>
Look up iframe on w3 schools to see what style attributes you can fiddle with.
Of course, there's many ways to skin a cat.
As davx says...
You could add .html to the recognized file types for the PHP module in the .htaccess file. However, this will slow down the generation of all html pages that have no PHP in them.
Or you could retype the html file as php, but you'll spend forever adding echo statements everywhere, plus you'll have to go through every link in the site that points to that page and change it unless you have a redirect rule in your htaccess. Messy.
Although, I would suggest davx solutions if you want to learn about server configuration.
