Question: Using unit analysis, convert 9 pounds into dollars. The rate of currency exchange is 1.566 United States dollars per 1 pound.
A ) 13.89 dollars
B ) 14.49 dollars
C ) 14.29 dollars
D ) 14.09 dollars
Steps to derive
1 Since 1.566 dollars = 1 pound, 1.566dollars1pound is equal to 1.
[Multiply by the ratio.]
2 9 pounds = 9 pounds x 1.566dollars1pound
[Cancel matching units.]
3 = 9 x 1.566 dollars
[Multiply.]
4 = 14.094 dollars
[Round to the nearest hundredths.]
5 ≈ 14.09 dollars
6 9 pounds equals 14.09 dollars.
Hence the right answer is Option D
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