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题库 / Prep2007E2-DS-52
For Manufacturer M, the cost C of producing x units of its product per month is given by C = kx + t, where C is in dollars and k and t are constants. Last month, if Manufacturer M produced 1,000 units of its product and sold all the units for k + 60 dollars each, what was Manufacturer M's gross profit on the 1,000 units?
(1) Last month, Manufacturer M's revenue from the sale of the 1,000 units was $150,000.
(2) Manufacturer M's cost of producing 500 units in a month is $45,000 less than its cost of producing 1,000 units in a month.
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.
两个条件都只能算出K，无法得知t
看清条件，不能误读
只能得出k的值而不能得出t的数值。遇到这种类型题的时候一定要手算看看能不能得出每一个变量的答案。