His thickness = (the thickness of a single sheet of paper) times (the n power of 2)

Note: n is the number of folds.

For example, the thickness of a single sheet of paper = 0. 1mm, which is 0.1* 2 5 = 3.2mm after being folded five times.

After 20% discount: 0.1* 220 =104857.6mm =104.8576m.