The expenditure of a family in a month is given in a pie chart. If the difference of expenditure between education and travel is $\text{Rs. }4,000$, then what will be the total income of the family?

Let the total monthly income of the family be $I$.From the survey data description:Expenditure on Education = $18\%$ of $I$ Expenditure on Travel = $8\%$ of $I$ The problem states that the difference between these two expenditures is $\text{Rs. }4,000$:
$$\text{Difference}=18\%-8\%=10\%\text{ of }I$$
$$10\%\text{ of }I=4000$$
$$\frac{10}{100}\times I=4000$$
$$I=4000\times 10=\text{Rs. }40,000$$
Therefore, the total income of the family is $\text{Rs. }40,000$.