A cook earns ₹8,400 per month. If she spends 60% of it each month, how much will she save (in ₹) by one-fourth of a year?

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RRB NTPC Graduate Level CBT-I Official Paper (Held On: 05 Jun, 2025 Shift 3)
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  1. 5,040
  2. 7,200
  3. 10,080
  4. 12000

Answer (Detailed Solution Below)

Option 3 : 10,080
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Detailed Solution

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Given:

Monthly income of the cook = ₹8,400

Percentage of income spent = 60%

Time period = One-fourth of a year = 3 months

Formula Used:

Monthly savings = Monthly income × (100% - Percentage spent)

Total savings = Monthly savings × Number of months

Calculation:

Monthly savings = 8,400 × (100% - 60%)

⇒ Monthly savings = 8,400 × 40%

⇒ Monthly savings = 8,400 × (40 / 100)

⇒ Monthly savings = 8,400 × 0.4

⇒ Monthly savings = ₹3,360

Total savings = Monthly savings × Number of months

⇒ Total savings = 3,360 × 3

⇒ Total savings = ₹10,080

The cook will save ₹10,080 in one-fourth of a year.

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