In Store A The Price Of Mayonnaise Went Down From $7.30 To $6.74 In Store B, It Went From $5.94 To $4.66 And In Store C It Went From $2.29 To $1.13.

What Was The Average Decrease ?

Question

In Store A The Price Of Mayonnaise Went Down From $7.30 To $6.74 In Store B, It Went From $5.94 To $4.66 And In Store C It Went From $2.29 To $1.13.


What Was The Average Decrease ?

anonymous · Answer

Average difference = sum of differences / number of differences

anonymous · Answer

12.53/3

anonymous · Answer

First you need to find all the differences.

Add those differences up (sum them), and divide that by the number of differences that exist (there are three, as you determined).

anonymous · Answer

Set A-15.53
Set B-12.53

anonymous · Answer

Okay, so you've determined the sum of prices before and the sum of prices after.  Doing it that way, you can then take the first minus the second.

anonymous · Answer

1 $

anonymous · Answer

Its 3

anonymous · Answer

Good.  That's your sum of differences.  Now, for the average, just divide by the number of differences there were.

anonymous · Answer

So 3/2

anonymous · Answer

Sorry, the number of differences from the start.

anonymous · Answer

How many different stores you looked at.

anonymous · Answer

3/3

anonymous · Answer

Good.  Exactly.  That's your average decrease in price.  $3/3, or $1.

anonymous · Answer

Rather than summing all the original prices and new prices, you could have also found the difference of each and added those.

(7.30-6.74) + (5.94-4.66) + (2.29-1.13) =

    0.56        +       1.28      +       1.16