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Question: Using unit analysis, convert 7 dollars into rupees. The rate of currency exchange is 46.20 Indian rupees per one United States dollar.


A ) 323.40 rupees
B ) 320.40 rupees
C ) 326.40 rupees
D ) 329.40 rupees

Steps to derive

1 Since 46.20 rupees = 1 dollar, 46.20 rupees/1 dollar is equal to 1.

2 7 dollars = 7 dollars x (46.2 rupees/1 dollar)

 [Use Unit analysis.]
3 = 7 x 46.20 rupees

 [Multiply.]
4 = 323.40 rupees

5 7 dollars equals 323.40 rupees.



Hence the right answer is Option A

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