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[求助]TT5-11

Q11:

A certain business produced x rakes each month form November through February and shipped x/2 rakes at the beginning of each month from March through October.  The business paid no storage costs for the rakes from November through February, but it paid storage costs of $0.10 per rake each month from March through October for the rakes that had not been shipped.  In terms of x, what was the total storage cost, in dollars, that the business paid for the rakes for the 12 months form November through October?

 

A.    0.40x

B.    1.20x

C.   1.40x

D.    1.60x

E.    3.20x

答案是C

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( 7/2 x + 0)/2 x 8 x 0.1 = 1.4x

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多谢

二分之七表示的是?不好意思,麻烦了

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7/2 x = 4x - x/2 = the amount of rakes to be charged "storage cost" on March

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