(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

Option B. $0.84

Step-by-step explanation:

As we know the formula of Consumer Price Index.

Here is Current price of the the product.

P = Price of the product in the base year

Now we will plug in the values for year 1970

------------(1)

Similarly for the year 1990.

 ---------(2)

Now we will divide equation 2 from 1.

Therefore, The price of a jar of grape jelly would be $0.84 in 1990.

22 dimes and 9 nickels

step-by-step explanation:

unless you made a typo, the answers are both a and c.

step-by-step explanation:

1.5/3 is .5 whereas 3/9 is .3333333 not proportional

22/33 is .66666 and 4/6 is also .66666 proportional

2/4 is .5 whereas 142/213 is .66666 not proportional

14/7 is 2 and 7/3.5 is also 2 proportional

you could've also checked it by doing this simple division:

if the larger fraction divides with the smaller fraction to equal 1, it is proportional. so let me show you what i mean:

when i divide 22/33 by 4/6 i get 1, so we know it is proportional, and it is the same with 14/7 and 7/3.5. now if i divide 3/9 by 1.5/3 i get .66666 so therefore we know it is not proportional.

there are many ways to do this so i wanted to show you some possible ways.