Practice Questions
Concept Explanation
Income-expenditure problems relate earning, spending, and savings through percentages. Savings = Income − Expenditure.
Basic Relation
If a person saves 20% of income, expenditure is 80% of income.
Change in Income or Expenditure
When income rises by a% and expenditure by b%, new savings = new income − new expenditure.
Equal Percent Trick
If income and expenditure both increase by the same percentage, savings also increase by that same percentage.
-
Q1 Easy
A person earns Rs. 20,000 per month and saves 25%. What is the monthly expenditure?
ExplanationExpenditure = 75% of 20,000 = Rs. 15,000. -
Q2 Easy
If income is Rs. 30,000 and expenditure is Rs. 24,000, what percent of income is saved?
ExplanationSavings = 6,000. Percent saved = (6,000/30,000) × 100 = 20%. -
Q3 Medium
Income increases by 20% and expenditure increases by 10%. If original income and expenditure were Rs. 25,000 and Rs. 20,000, new savings are:
ExplanationNew income = 30,000. New expenditure = 22,000. Savings = Rs. 8,000. -
Q4 Easy
A man spends 70% of his income. If his income is Rs. 18,000, his savings are:
ExplanationSavings = 30% of 18,000 = Rs. 5,400. -
Q5 Easy
Expenditure is 80% of income. If income is Rs. 40,000, savings are:
ExplanationSavings = 20% of 40,000 = Rs. 8,000. -
Q6 Hard
Income rises by 25% while expenditure rises by 20%. Original income and expenditure are Rs. 32,000 and Rs. 24,000. New savings are:
ExplanationNew income = 40,000. New expenditure = 28,800. Savings = Rs. 11,200. -
Q7 Medium
If savings are 15% of income and income is Rs. 24,000, expenditure is:
ExplanationExpenditure = 85% of 24,000 = Rs. 20,400.
-
Q8 Hard
Income is Rs. 10,000 and expenditure is Rs. 8,000. If income increases by 25% and expenditure by 10%, new savings are:
ExplanationNew income = 12,500. New expenditure = 8,800. Savings = Rs. 3,700. -
Q9 Medium
A family saves 30% of Rs. 35,000 income. Monthly expenditure is:
ExplanationExpenditure = 70% of 35,000 = Rs. 24,500. -
Q10 Easy
If expenditure is 90% of income, savings as a percentage of income is:
ExplanationSavings = 10% of income. -
Q11 Medium
Income increases from Rs. 28,000 to Rs. 35,000 while expenditure stays at Rs. 21,000. New savings percentage of new income is:
ExplanationNew savings = 14,000. Percent = (14,000/35,000) × 100 = 40%. -
Q12 Easy
A person spends Rs. 18,000 which is 60% of income. Income is:
Explanation60% of income = 18,000 → income = Rs. 30,000. -
Q13 Hard
Income and expenditure both increase by 10%. If original savings were Rs. 2,000, new savings are:
ExplanationWhen income and expenditure rise by the same percent, savings also rise by 10%. New savings = Rs. 2,200. -
Q14 Medium
If monthly income is Rs. 36,000 and Rs. 27,000 is spent, savings as a percent of income is:
ExplanationSavings = 9,000. Percent saved = (9,000/36,000) × 100 = 25%.
-
DS1 Easy
What is the monthly expenditure?
Statement IIncome is Rs. 20,000.
Statement IISavings are 25% of income.
ExplanationExpenditure = 75% of 20,000 = Rs. 15,000. Both needed. -
DS2 Medium
What are the new savings?
Statement IIncome rises 20% from Rs. 25,000.
Statement IIExpenditure rises 10% from Rs. 20,000.
ExplanationNew income = 30,000, new expenditure = 22,000, savings = Rs. 8,000.
-
DS3 Easy
What percent of income is saved?
Statement IIncome is Rs. 30,000.
Statement IIExpenditure is Rs. 24,000.
ExplanationSavings = 6,000. Saved percent = 20%. Both needed. -
DS4 Medium
Is savings more than Rs. 10,000?
Statement INew income is Rs. 40,000 after a 25% increase on Rs. 32,000.
Statement IINew expenditure is Rs. 28,800 after a 20% increase on Rs. 24,000.
ExplanationNew savings = 40,000 − 28,800 = 11,200, which exceeds Rs. 10,000.