Sarah's hand length is $20 \mathrm{~cm}$. She measures the dimensions of her rectangular floor to be 18 by 22 hand lengths. Which of the following is the closest to the area of the floor?
(A) $160000 \mathrm{~cm}^{2}$
(D) $16000 \mathrm{~cm}^{2}$
(B) $80000 \mathrm{~cm}^{2}$
(E) $20000 \mathrm{~cm}^{2}$
(C) $200000 \mathrm{~cm}^{2}$
The width of Sarah's rectangular floor is 18 hand lengths.

Since each hand length is $20 \mathrm{~cm}$, then the width of the floor is $18 \times 20=360 \mathrm{~cm}$.

The length of Sarah's rectangular floor is 22 hand lengths.

Since each hand length is $20 \mathrm{~cm}$, then the length of the floor is $22 \times 20=440 \mathrm{~cm}$.

Thus the area of the floor is $360 \times 440=158400 \mathrm{~cm}^{2}$.

Of the given answers, the closest to the area of the floor is $160000 \mathrm{~cm}^{2}$.

ANSWER: (A)