RRB NTPC Graduate Tier 1

2025

Shift-3

Algebra 2

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Analogy 7

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Computer Knowledge 4

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Geography 4

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Geometry 2

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History 4

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Interest 4

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Modern History 4

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Percentage 2

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Series 5

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Simplification 1

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Statistics 1

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Time and Work 5

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Trigonometry 1

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Interest

Simple Interest

EN हिंदी

✕

RRB NTPC Graduate Tier 1 2025 Shift-3 📅 06 Jun, 2025

At what rate of interest (in percentage) per year will a sum of money double itself in 4 years on simple interest?

A

25%

B

50%

C

27%

D

23%

Result Summary

APEDIA

RRB NTPC Graduate Tier 1

2025 • 06 Jun, 2025 • Shift-3

At what rate of interest (in percentage) per year will a sum of money double itself in 4 years on simple interest?

Correct Answer

25%

Understanding the Condition: For a sum of money to 'double itself', the accumulated interest must be exactly equal to the initial principal amount. So, Simple I......

💡 Analysis & Explanation

Understanding the Condition ▼

For a sum of money to 'double itself', the accumulated interest must be exactly equal to the initial principal amount. So, Simple Interest (SI) = Principal (P).

Applying the Formula ▼

The formula for Simple Interest is $SI = (P \times R \times T) / 100$. We substitute SI with P, and Time (T) with 4 years.

Solving for Rate (R) ▼

$P = (P \times R \times 4) / 100$. The 'P' on both sides cancels out, leaving $1 = 4R / 100$. This implies $4R = 100$, and therefore $R = 25$.

Conclusion ▼

The required rate of interest is 25% per annum.