landing_pages (page_id, page, visits, signups) holds this week's traffic for each landing page. One page went live today and has no visits yet.
Report each page's conversion_pct: signups as a percentage of visits, rounded to 1 decimal place. A page with 0 visits has no conversion rate yet: show it as NULL (not 0, and not an error). Every page must appear.
Columns: page, visits, signups, conversion_pct. Sort by page.