Economía al revés: uso eficiente del papel higiénico

En Agoraphilia.

Using basic geometry and a measuring tape, I found the following:

• The diameter of a typical roll of toilet paper is about 10 cm, of which about 4 cm is space inside the tube and 6 cm is paper.
• The paper’s starting depth is about 3 cm (on each side of the tube), with 100% of the paper remaining.
• When the paper appears half gone, with 1.5 cm of depth, the actual fraction of paper remaining is only 39%.
• When the paper appears three-quarters gone, with .75 cm of depth, the actual fraction of paper remaining is only 17%.