单选:设Q为销售量,P为价格,当∑Q0P0=120万元,∑Q1P1=165万元,∑Q1P0=135万元,∑Q0P1=140万元时,拉氏价格指数是(

题目内容:
设Q为销售量,P为价格,当∑Q0P0=120万元,∑Q1P1=165万元,∑Q1P0=135万元,∑Q0P1=140万元时,拉氏价格指数是()。
A.112.5%
B.116.7%
C.117.9%
D.122.2%
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