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Math·Geometry and Trigonometry·Area and volume

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	Area (square inches)	Perimeter (inches)
Rectangle A	630	210
Rectangle B	2,520	n

The table gives the areas and perimeters of two similar rectangles, where $n$ is a constant.

What is the value of $n$?

A

$2,100$

B

$1,680$

C

$840$

D

$420$