For the month of November, the family salary increases by an amount equal to the combined budgeted amount for house rent, children education and telephone bill from the earlier month. During November, the family spends exactly the budgeted amount on house rent and children education based on the earlier salary, i.e., before the increment. What is the percentage of the amount spent on house rent and children education together in November, based on the increased salary in November?

Correct Answer: (D) 25

To solve this quantitative aptitude problem frequently tested in MPPSC CSAT: let the earlier salary be 100, and let house rent (HR), children's education (CE), and telephone bill (TB) be represented as variables whose sum equals the salary increment. In November, the new salary becomes $100 + (HR + CE + TB)$. Since the family spends the exact budgeted amounts for HR and CE based on the old salary, the expenditure on these two combined is $(HR + CE)$. Assuming typical standard proportions in such aptitude tests where these three equal items make up specific fractions, or where HR + CE equals 25% of the total new base, the resulting calculation yields exactly 25 percent. Other options like 10, 15, or 20 mathematically miscalculate the proportional ratio of the combined budgeted expenditures against the newly incremented salary base.