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21. A rectangular napkin costs $3.25. A similar tablecloth is five times longer and five times wider. How muchwould you expect to pay for the tablecloth?A. $48.75B. $16.25C. $32.50D. $81.25

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Notice that the area of the tablecloth will be 25 times bigger than the area of the napkin. If L and W are the dimensions of the napkin, then its area is given by:


A_N=L\cdot W

Compute the area of the table cloth if its length is 5L and its width is 5W:


A_T=5L\cdot5W=25L\cdot W=25\cdot A_N

Assuming that the cost is directly proportional to the area, then the cost of the tablecloth will be 25 times the cost of the napkin:


25*3.25=81.25

Therefore, we can expect to pay $81.25 for the tablecloth.

User Mats Carlsson
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