If the difference between the two expenditures are represented by 18 in the pie-chart, then these expenditures possibly are
Central angle of 18=(18360×100)% of the total expenditure
= 5% of the total expenditure.
From the given 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 the total expenditure
= 5% of the total expenditure.