chetan2u wrote:
A farmer wants to allocate her expenditures to maximize her profits during the coming year. Let
C be her spending on cropland,
F her spending on fertilizer,
L her spending on labor,
M her spending on machinery, and
S her spending on seed. She has estimated that, if she allocates at least 100 euros to each of these categories, then her profit during the coming year will be (
C – 97)(
L – 92)(
S – 95)(
M – 87)(
F – 90) euros. She wishes to calculate the benefits of expenditure greater than 100 euros in one these categories, if she were to spend exactly 100 euros in each of the others.
Select for
Greatest returns the resource for which, according to the desired calculation from the model, each euro of spending beyond 100 euros is predicted to make the greatest contribution to profits (or least contribution to losses). And select for
Least returns the resource for which, according to the desired calculation, each euro of spending beyond the minimum necessary amount is predicted to make the least contribution to profits (or greatest contribution to losses). Make only two selections, one in each column.
Profit = (
C – 97)(
L – 92)(
S – 95)(
M – 87)(
F – 90) euros
Assume 100 euros spent on each category.
Profit = 3 * 8 * 5 * 13 * 10
Now think: She wants to allocate 1 euro extra. Where should she allocate it? Should she give it to C to get 4 as the first term or to say M to get 14 as the second last term? By allocating 1 euro to 3, she is increasing it by 33.3% i.e.
Profit = (3 * 133/100) * 8 * 5 * 13 * 10
So essentially, the profit has gotten multiplied by 133/100.
On the other hand, if she were to allocate 1 euro to 13, then she would increase it by about 7% to 8%
Profit = 3 * 8 * 5 * 13 * (107/100)* 10
So essentially, the profit has gotten multiplied by 107/100.
Hence, to
MAXIMIZE profit, she should allocate additional money to C Cropland and to
MINIMIZE she should allocate it to M Machinery.
ANSWER.
Method 2: Think about it this way:
Say I want to double the profit:
Profit = 3 * 8 * 5 * 13 * 10
* 2How much money do I need to do this?
If I double 3 (Profit = 6 * 8 * 5 * 13 * 10), I need just 3 additional euros
but if I double 13 (Profit = 3 * 8 * 5 * 26 * 10), I need 13 additional euros.
So 3 will give maximum increase in profit with minimum money and 13 will give minimum increase in profit.
Here is
a video discussing how to handle Two Part Analysis Questions.