From 1980 to 2000, the consumer price index (CPI) increased from 82.4 to
172.2. If a pound of margarine cost $0.51 in 1980 and the price of margarine
increased at the same rate as the CPI from 1980 to 2000, approximately how
much did a pound of margarine cost in 2000?
A. $0.56
B. $1.07
C. $0.82
D. $1.72