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Naveena's monthly income is ₹84,000. She spends 25% of his income on house rent, 20% on groceries, 15% on other household expenses, and saves the remaining amount. How much money (in ₹) does she save every month?
32,000
32,600
33,600
33,000
33,600
Sum all expenditure percentages first: 25+20+15=60%. The saving percentage is 100%−60%=40%. Simply calculate 40% of 84,000 by doing 84×4=336 followed by two zeros.
Monthly income = ₹84,000, Rent = 25%, Groceries = 20%, Other expenses = 15%.
Savings=Income×(100%−(Expense1%+Expense2%+Expense3%))
Sum all expenditure percentages first: 25+20+15=60%. The saving percentage is 100%−60%=40%. Simply calculate 40% of 84,000 by doing 84×4=336 followed by two zeros.
Students often waste time calculating each expense individually (e.g., 25% of 84,000, 20% of 84,000, etc.) instead of summing the percentages first.
Calculate total percentage of expenditure
Add the percentages allocated to rent, groceries, and other expenses.
Total Expense%=25%+20%+15%=60%
Calculate percentage of savings
Subtract total expenditure from the total income percentage (100%).
Saving%=100%−60%=40%
Calculate absolute value of savings
Apply the 40% rate to the total income of ₹84,000.
Savings=0.40×84000=33600
C is correct because the calculated savings amount is ₹33,600.
This concept of additive percentages is foundational for Data Interpretation (DI) questions in competitive exams, where pie charts represent components of a total.
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