问题描述：
用宏观经济学原理回答
If the consumer price index has a value of 150 today and the base year is 1987,then consumer prices have( )
A.increased by 50 percent since 1987
B.doubled since 1987
C.more than doubled since 1987
D.declined 50 percent since 1987
If the consumer price index has a value of 150 today and the base year is 1987,then consumer prices have( )
A.increased by 50 percent since 1987
B.doubled since 1987
C.more than doubled since 1987
D.declined 50 percent since 1987
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