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Mathematics
Simple & Compound Interest
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NTPC Graduate Tier 1 2025 Shift-1 📅 06 May, 2025

Find the duration (in years) in which ₹1,200 will amount to ₹2,280 at a rate of 4% per annum simple interest.

A
22.5
B
21.5
C
23.5
D
24.5
Result Summary
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NTPC Graduate Tier 1
2025 • 06 May, 2025 • Shift-1
Find the duration (in years) in which ₹1,200 will amount to ₹2,280 at a rate of 4% per annum simple interest.
Correct Answer
22.5
Interest Identification: The total Simple Interest (I) accumulated is the difference between the Final Amount and the Principal. I = 2280 - 1200 = 1080.Formula ......
Ref/Book : NTPC Graduate Tier 1 2025
Ref. Subject Mathematics
Chapter -
Ref. Topic Simple & Compound Interest
Pg. No -
💡 Analysis & Explanation
Interest Identification ▼
The total Simple Interest (I) accumulated is the difference between the Final Amount and the Principal. I = 2280 - 1200 = 1080.
Formula Setup ▼
The standard formula for Simple Interest is I = (Principal × Rate × Time) / 100.
Data Substitution ▼
Plugging the available numbers into the equation yields 1080 = (1200 × 4 × Time) / 100.
Solving for Time ▼
Simplifying the right side gives 1080 = 48 × Time. Dividing 1080 by 48 results in 22.5.
Conclusion ▼
The required duration for the investment to reach the target amount is 22.5 years.
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