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?

Result

x =  8 cm

Solution:

o=0.2 mm=0.2/10 cm=0.02 cm  x=10−100⋅ o=10−100⋅ 0.02=8 cmo=0.2 \ mm=0.2 / 10 \ cm=0.02 \ cm \ \\ \ \\ x=10 - 100 \cdot \ o=10 - 100 \cdot \ 0.02=8 \ \text{cm}

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