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1 [单选题]14 Alpha buys goods from Beta. At 30 June 2005 Beta’s account in Alpha’s records showed $5,700 owing to Beta.
Beta submitted a statement to Alpha as at the same date showing a balance due of $5,200. Which of the following could account fully for the difference?
A. Alpha has sent a cheque to Beta for $500 which has not yet been received by Beta.
B. The credit side of Beta’s account in Alpha’s records has been undercast by $500.
C. An invoice for $250 from Beta has been treated in Alpha’s records as if it had been a credit note.
D. Beta has issued a credit note for $500 to Alpha which Alpha has not yet received.
2. [单选题]C Co uses material B, which has a current market price of $0·80 per kg. In a linear program, where the objective is to maximise profit, the shadow price of material B is $2 per kg. The following statements have been made:
A. (i) Contribution will be increased by $2 for each additional kg of material B purchased at the current market price
B. (ii) The maximum price which should be paid for an additional kg of material B is $2
C. (iii) Contribution will be increased by $1·20 for each additional kg of material B purchased at the current market price
D. (iv) The maximum price which should be paid for an additional kg of material B is $2·80
E. Which of the above statements is/are correct?
F. (ii) only
G. (ii) and (iii)
H. (i) only
I. (i) and (iv)
1、正确答案 ：D
2、正确答案 ：I
解析：Statement (ii) is wrong as it reflects the common misconception that the shadow price is the maximum price which should be paid, rather than the maximum extra over the current purchase price.
Statement (iii) is wrong but could be thought to be correct if (ii) was wrongly assumed to be correct.
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