1.  If the difference between the two expenditures are represented by 18º in the pie-chart, then these expenditures possibly are :

A. Binding Cost and Promotion Cost
B. Paper Cost and Royalty
C. Binding Cost and Printing Post
D. Paper Cost and Printing Cost

Answer: Option D

Explanation:

Central angle 18º =  18/360 x 100 % of the total expenditure
= 5% of the total expenditure.
From the pie-chart it is clear that :
Out of the given combinations, only in combination (D) the difference is 5%
i.e. Paper Cost - Printing Cost 
= (25% - 20%) of total expenditure
= 5% of total expenditure.