A company's revenue in 2002 was 20% higher than that in 2001, and its revenue in 2003 was 25% lower than that in 2002, while its cost in 2002 was 20% lower than that in 2001, and its cost in 2003 was 30% higher than that in 2002. Assuming that the profit of this company in 2001, 2002 and 2003 are X, Y and Z respectively, what is the correct order of X, Y and Z?
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Ax < y < z
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Bx < z < y
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Cz < x < y
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Dz < y < x
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Ey < z < x
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正确答案: C