Kayla went for a walk every day last week. Each day, she walked half as far as she did the day before. If she walked 8 kilometres on Monday last week, how many kilometres did she walk on Friday last week?
(A) 0.25
(B) 4
(C) 1
(D) 2
(E) 0.5
Kayla walked $8 \mathrm{~km}$ on Monday.

On Tuesday, she walked $8 \div 2=4 \mathrm{~km}$.

On Wednesday, she walked $4 \div 2=2 \mathrm{~km}$.

On Thursday, she walked $2 \div 2=1 \mathrm{~km}$.

On Friday, she walked $1 \div 2=0.5 \mathrm{~km}$.

ANSWER: (E)