A store purchased 20 coats that each cost an equal amount and then sold each of the 20 coats at an equal 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 gross 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 $440.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
错因:不明白题意
关键:虚拟语气
(1) 是不充分的。设进价为每件$x,售价为每件$y,题目要求20(y-x)。(1) 只说了20*(2y-x)=2400,只能求出2y-x,求不出y-x。
(2) 是充分的。(2) 的意思是20*((y+2)-x)=440,那么20*(y-x)当然就是$400了。
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