[問題]PREP-T2-Q158 (DS)

[oneseven]

A store purchased 20 coats that each cost an equal amount and then sold each of the 20 coats at an euqal price. What was the store's gross profit on the 20 coats?

(1) If the selling price per coat had been twice as much, the store's gorss profit on the 20 coats would have been $2,400
(2) If the selling price per coat had been $2 more, the store's gross profit on the 20 coats would have been $440

Answer : B

條件(1) 和(2) 不是都清楚的說了淨利是多少了嗎
為何不是D呢
是我會錯意嗎 請教 謝謝

[hey]

設售價為S, 成本為C
條件一:(2S-C)20=2400
40S-20C=2400
其有兩個未知數, 根本就解不出來
條件二:(S+2-C)20=440
20S+40-20C=440
20S-20C=400
題目本來就是要求這20件的毛利, 所以條件二可解出答案, 毛利為400
所以選(B)