Some of the examples based on area chart are given below:
Example 1: Prepare a area diagram from the following particulars relating to the production of a commodity in a factory.
Units produced

$\$$ 1000 
Cost of raw materials 
$\$$ 5000 
Direct expenses 
$\$$ 2000 
Indirect expenses 
$\$$ 1000 
Profit 
$\$$ 1000 
Solution:For the given problem we need to find the cost of material, expenses and profits per unit as given below:
cost of raw material per unit : $\$$
$\frac{5000}{1000}$ = $\$$ 5
Direct expenses per unit : $\$$
$\frac{2000}{1000}$ = $\$$ 2
Indirect expenses per unit : $\$$
$\frac{1000}{1000}$ = $\$$ 1
Profit per unit : $\$$
$\frac{1000}{1000}$ = $\$$ 1
Diagram showing cost and profit for a commodity in a factory.Example 2: The following data relates to the monthly expenditure in $\$$ of two families A and B.

Expenditure (in $\$$) 
Item of Expenditure 
Family A 
Family B 
Food 
160 
120 
Clothing 
80 
32

Rent 
60 
48 
Lights and fuel 
20 
16

Miscellaneous 
80 
24

Total 
400 
240

Represent the above data using a suitable diagram.Solution: From the given data it is clear that the total expenses of the two families are different, an appropriate percentage diagram for the above data will be rectangular diagram on percentage basis. The percentage bar diagram will not be able to reflect the inherent differences in the total expenditures of the two families.
Widths of the rectangles will be taken in the ratio of the total expenses of the two families
400 : 240
$\rightarrow$5 : 3
Calculating percentages is shown below in the table.

Family A 
Family B 
Item of Expenditure 
$\$$. 
% 
Cumulative % 
$\$$. 
% 
Cumulative % 
Food 
160 
40 
40 
120 
50 
50 
Clothing 
80 
20 
60 
32 
13.33 
63.33 
Rent 
60 
15 
75 
48 
20 
83.33 
Light and Fuel 
20 
5 
80 
16 
6.67 
90 
Miscellaneous 
80 
20 
100 
24 
10 
100 
Total 
400 
100 

240 
100 

Given below is the image.Example 3: Draw a suitable diagram to represent the following information.



Total cost in $\$$ 

Selling price per unit (in $\$$.) 
Quantity sold 
wages 
Materials 
Misc. 
Total 
Factory X 
400 
20 
160 
120 
80 
360 
Factory Y 
600 
30 
200 
200 
300 
700 
Show also the profit or loss as the case may be.
Solution: Calculate the cost per unit as given in the below table.


Cost per unit (in $\$$) 

Selling price per unit (in Rs.) 
Quantity sold 
wages 
Materials 
Misc. 
Total 
Profit per unit (in $\$$)

400 
20 
160 
120 
80 
360 
400  360 = 40 
600 
30 
200 
200 
300 
700 
600  700 = 100 
Negative profit is regarded as loss.
An appropriate diagram for representing this data would be the 'Rectangles' whose widths are in the ratio of the quantities sold. 20 : 30
$\rightarrow$ 2 : 3
Selling is represented by the corresponding heights of the rectangles with various factors of cost and profit or loss represented by the various divisions of the rectangles as shown below.
Sub divided rectangle showing cost, sales and profit or loss per unit: