Ask them " who trainedy them? " Good answer would be. - They was an installers helper for 2 years. Eventually got all tools needed by getting one every week or so. Saved up bought a van. Made some cards. And did as good as a job as possible on every job that way to earn repeat customers
15 by 14 is 210 Sq ft which is 23.33 yards If installation is 5$ a yard Pad is 3$ a yard. Carpet you get a 12 $ a yard carpet (med. Grade) So right at about 500$ is what you'd be looking at