Pencil cut

Veronika cut 10cm pencil. Each turn, the pencil was reduced by 0.2mm. She turned the pencil 100 times. How many centimeters has a pencil now?

Correct answer:

x =  8 cm

Step-by-step explanation:

$$\begin{gathered} o=0.2\text{ mm}\to \text{ cm}=0.2\mathrm{/}10\text{ cm}=0.02\text{ cm } \\ x=10-100\cdot o=10-100\cdot 0.02=8\text{ cm} \end{gathered}$$

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