In what time will ₹10,000 at 4% per annum, produce the same interest as ₹8,000 does in 4 years at 5% simple interest?

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SSC CGL 2023 Tier-I Official Paper (Held On: 14 Jul 2023 Shift 1)
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  1. 5 years
  2. 3 years
  3. 4 years
  4. 6 years

Answer (Detailed Solution Below)

Option 3 : 4 years
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Detailed Solution

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Given 

A person invests on simple interest = Rs. 10000

A person invests on simple interest = Rs. 8,000

Rate of Interest = 4%

Rate of Interest = 5%

Time = t year

Time = 4 year

Formula used.

Simple interest = Principal × Time × Rate/100

Amount = Principal(1 - Rate/100)2

Calculation 

The Rate of Interest for the first and second sum is 4% and 5% p.a. respectively.

(10000 × 4 × t) / 100 = ((8000) × 4 × 5) / 100

⇒ 40t = 160

⇒ t = 160/40

⇒ t = 4

The value of t (in percentage) is 4 years.

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