## 250. Math Puzzle $3 / 86$

Fold a technikus page, $0.05 \mathrm{~mm}$ thick, 50 times and note how high the resulting stack is.

Those who don't have enough strength in their fingers can also calculate it.
The best way to use the formula is $y=a \cdot 2^{n}$. For $a=0.05 \mathrm{~mm}$ and $n=50$, one gets $56.3 \cdot 10^{6}$ $\mathrm{km}$.

A stack of a "technikus" page folded 50 times would thus be over 56 million kilometers high!! If we were to stack all the "technikus" printed in the last 10 years, the stack would be "only" about $32 \mathrm{~km}$ thick.