htaccess php to html

Options +FollowSymlinks
RewriteEngine on
ErrorDocument 500 /error_page.php
ErrorDocument 404 /error_page.php
ErrorDocument 401 /error_page.php
ErrorDocument 403 /error_page.php
RewriteRule ^merchantpage/([0-9]+)/([0-9]+)/([a-zA-Z0-9_-]+)\.html$ merchantpage.php?id=$2
RewriteRule ^index.html index.php
RewriteRule ^aboutus.html aboutus.php
RewriteRule ^merchantpagelistbyletter.html merchantpagelistbyletter.php
RewriteRule ^contactus.html contactus.php
RewriteRule ^terms.html terms.php
RewriteRule ^goclick.html goclick.php