MATH SOLVE

5 months ago

Q:
# Please help! (25pt and brainliest) From 1970 to 1990, the consumer price index (CPI) increased from 38.8 to 130.7. If a jar of grape jelly cost $0.25 in 1970 and the price of grape jelly increased at the same rate as the CPI from 1970 to 1990, approximately how much did a jar of grape jelly cost in 1990? A. $0.59 B. $0.84 C. $1.31 D. $0.39

Accepted Solution

A:

formula: cp1/cp2 = price1/price2

so let x be the new price,

38.8/130.7 = .25/x

x = .25*130.7/38.8

so, you get

x = 0.84

so let x be the new price,

38.8/130.7 = .25/x

x = .25*130.7/38.8

so, you get

x = 0.84