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 1987B.doubled since 1987C.more than doubled since 1987D.declined 50 percent since

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

A,因为基数是100.现在是150,所以上涨了50%.