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FEED • Stack 7KEY
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Answer Key
Stack 7
Check your answers for all five Vaults!
Vault 1
Money & Smart Spending
💼
Vault 2
Earning, Saving & Goals
📋
Vault 3
Budgeting & Money Management
🏛️
Vault 4
Banking & Digital Payments
📈
Vault 5
Growing Money & Tax
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Published by INFINTRIX | Edition 1 | 2026
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FEED • Stack 7KEY
Vault 1:
Money & Smart Spending
Activity A: Demand & Supply
1. Down — high supply of mangoes
2. Up — high demand for gold
3. Stronger — more dollar supply in India
4. Weaker — India needs to buy more dollars for oil
Activity B: BNPL Calculator
1. ₹3,000 + ~₹135 interest = ~₹3,135
2. ₹20,000 + ~₹2,640 interest = ~₹22,640
3. ₹8,000 + ~₹480 interest = ~₹8,480
(Accept approximate answers; exact calculation varies by method)
Activity C: Lifestyle Inflation
Year 2: Savings = ₹3,000 — Trap (income +₹10K, savings same)
Year 3: Savings = ₹10,000 — Smart (savings grew more)
Year 4: Savings = ₹3,000 — Trap (back to low savings)
Activity D: Case Study Analysis
1. She spent on wants using credit and only paid the minimum balance, letting interest pile up
2. Stop using the credit card, pay more than the minimum each month, and create a repayment plan
3. Only use credit for genuine needs, always pay the full bill on time, and save before buying wants
Activity E: Quick Quiz
Q1. b) Gets weaker
Q2. b) The pain of paying is hidden
Q3. b) Buy Now Pay Later
Q4. b) Spending rises with income
Q5. b) Gets weaker
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Vault 2:
Earning, Saving & Goals
Activity A: Profit% & Loss% Calculator
1. Profit = ₹180, Profit% = (180÷120)×100 = 150%
2. Profit = ₹200, Profit% = (200÷800)×100 = 25%
3. Loss = ₹600, Loss% = (600÷3000)×100 = 20%
4. Profit = ₹2,500, Profit% = (2500÷5000)×100 = 50%
5. Loss = ₹100, Loss% = (100÷500)×100 = 20%
Activity B: Compare the Businesses
1. A: (100÷200)×100 = 50%; B: (200÷1000)×100 = 20%. A is better return.
2. A: (120÷400)×100 = 30%; B: (150÷600)×100 = 25%. A is better return.
3. A earns more total profit (₹500 vs ₹450). A has better Profit% (infinite vs ~128.6%). Accept reasoned answers.
Activity C: Freelancing Idea Planner
Open-ended activity. Answers will vary based on student’s chosen skill. Check that Profit = Charge − Cost, and Profit% = (Profit ÷ Cost) × 100 is calculated correctly. Monthly earning = Profit × 4 jobs.
Activity D: Case Study — Yashna’s Tough Week
1. Total income: ₹240 + ₹400 = ₹640
2. Total cost: ₹240 (jewelry materials)
3. Net earnings: 640 − 240 = ₹400
4. Jewelry: SP = CP = ₹240, so no profit, no loss (0%)
5. Diversification — graphic design income saved the week
Activity E: Quick Quiz
Q1. b) 25% — Profit=₹100, (100÷400)×100=25%
Q2. c) Working independently for different clients
Q3. b) Diversification
Q4. b) 15% — Loss=₹150, (150÷1000)×100=15%
Q5. a) Business X (50%) — X: (50÷100)×100=50%; Y: (100÷500)×100=20%
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Vault 3:
Budgeting & Money Management
Activity A: My Monthly Income-Expense Ledger
Student’s own answers — personal ledger activity. Check that Income and Expense tables are filled, totals calculated, and Surplus/Deficit correctly identified.
Activity B: Calculate Savings
1. Total expenses: ₹710
2. Leaks: Canteen (₹200), auto (₹80), random (₹50) = ₹330
3. Total leaked: ₹330
4. New expenses: 710 − 330 = ₹380
5. New savings: 800 − 380 = ₹420/month
Activity C: Leak Plugger
1. Walk to friend’s house. Saving: ₹240/month
2. Use existing stationery. Saving: ₹120/month
3. Pack snacks from home. Saving: ₹220/month
Activity D: Find the Money Leaks!
1. Leaks: Daily samosa (₹250), fancy pen lost (₹40), auto to walkable market (₹60) = 3 leaks
2. Total leaked: ₹250 + ₹40 + ₹60 = ₹350
3. Leak % = (350 ÷ 600) × 100 = 58.3%
4. Bring tiffin instead of samosa; walk instead of auto
5. All leaks plugged: ₹600 − ₹270 = ₹330 saved
Activity E: Quick Quiz
Q1. b) A small, unplanned expense that adds up over time
Q2. c) ₹300 — ₹10 × 30 = ₹300
Q3. b) Surplus — Income > Expenses
Q4. b) Track where your money comes from and goes
Q5. c) Track every expense — can’t manage what you don’t measure!
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Vault 4:
Banking & Digital Payments
Activity A: Choose the Right Transfer
1. NEFT — ₹15,000, not urgent
2. RTGS — ₹3,00,000, above ₹2L, immediate
3. UPI — ₹200, instant, 10 PM Sunday
4. IMPS — ₹40,000, 2 AM, 24/7
5. RTGS — ₹8L, above ₹2L, real-time
Activity B: Spot the Scam
1. REAL — Official alert, no links, no OTP request
2. SCAM — RBI never calls; asks Aadhaar; urgency
3. SCAM — Spelling errors, fake URL, asks OTP
4. REAL — Official app, helpline, no OTP asked
Activity C: OTP Safety
1. anyone   2. bank   3. block
4. link   5. report   6. verification
Activity D: Transfer Calculator
1. UPI — ₹150, low urgency
2. RTGS — ₹4L, HIGH urgency
3. IMPS/UPI — ₹2,000, late night
4. NEFT/IMPS — ₹50,000, medium
5. UPI — ₹80, low urgency
Activity E: Quick Quiz
Q1. b) RTGS — minimum ₹2,00,000
Q2. d) All of these — all work 24/7
Q3. c) Hang up — banks NEVER ask for OTP
Q4. b) Unified Payments Interface
Q5. c) RTGS — no max limit, real-time
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Vault 5:
Growing Money & Tax
Activity A: Year-by-Year CI
Year 1: ₹5,000 + ₹500 = ₹5,500
Year 2: ₹5,500 + ₹550 = ₹6,050
Year 3: ₹6,050 + ₹605 = ₹6,655
1. Total CI = ₹1,655
2. SI = ₹500 × 3 = ₹1,500
3. CI − SI = ₹155 extra
Activity B: SI vs CI (5 years)
SI: ₹1,000/yr × 5 = ₹5,000. Total = ₹15,000
CI: Yr1-5: ₹11K → ₹12.1K → ₹13.3K → ₹14.6K → ₹16,105
1. CI gives ₹1,105 more than SI
2. CI earns on growing total, not just original
Activity C: Mutual Fund Matching
1 → C (Mutual Fund — pool money)
2 → A (SIP — fixed monthly)
3 → D (Fund Manager)
4 → B (NAV — unit price)
5 → E (Rupee Cost Averaging)
Activity D: Word Problems
1. Yr1: ₹2,200 | Yr2: ₹2,420
2. GST = ₹2,700. Total = ₹17,700
3. Pooled money, expert invests, everyone shares returns
4. SI = ₹1,200. Total = ₹6,200
5. 72 ÷ 8 = 9 years
Activity E: Quick Quiz
Q1. b) ₹1,331
Q2. b) Interest on growing total
Q3. c) The fund manager
Q4. c) ₹118
Q5. b) Systematic Investment Plan