_:nf255b83a3bc5478b9f99d5aa4fdf0e5fxb18
<http://schema.org/text>
"Add 10% extra to avoid running out of carpeting. Mistakes can happen while carpet is being installed, and it’s always better to have too much carpeting than too little. So, add in an extra 10% of the total to make sure that you’ll have enough carpeting to compensate for any errors your or the carpet installers may make.\nIn our example, the total stair surface area came to 96 square feet (8.9 m). Adding an extra 10% to this estimate gives us a final figure of: 106 square feet (9.8 m)."
<https://www.wikihow.com/Calculate-Carpet-on-Stairs>