The affordable bundle of brie and plums for Eve that does not use all her income is 2 wheels of brie and 6 plums.
Eve has a monthly income of $20, and the price of a wheel of brie is $5, while the price of a plum is $0.50. We can represent the number of wheels of brie that Eve buys as 'x' and the number of plums as 'y'.
Therefore, the budget constraint can be represented as:
5x + 0.5y ≤ 20
We want to find a bundle of brie and plums that Eve can afford but does not use all her income. This means that we need to find a point on the budget constraint that lies below the $20 line.
One way to do this is to substitute different values of 'x' and 'y' that satisfy the inequality until we find a combination that fits the criteria. For example, if we let x = 2 and y = 6, we get:
5(2) + 0.5(6) = 11 ≤ 20
This means that Eve can afford to buy 2 wheels of brie and 6 plums for a total cost of $11, which is within her budget of $20. This bundle of brie and plums does not use all her income, as she still has $20 - $11 = $9 left over.
Note- the complete question is this...