Calculate the compound interest on Rs 16000 at 10% per annum for 2 years when compounded half yearly.

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Bihar STET TGT (Hindi) Official Paper-I (Held On: 10 Sept, 2023 Shift 1)
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  1. 18600
  2. 3448.1
  3. 18640
  4. 17600

Answer (Detailed Solution Below)

Option 2 : 3448.1
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Bihar STET Paper 1 Mathematics Full Test 1
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Detailed Solution

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Given:

Sum = Rs. 16000

Rate = 10% 

Time = 2 year

Concept used:

When the rate is calculated half-yearly,

R becomes R/2.

T becomes 2T.a

Formula used:

A = P(1 + R/100)T

C.I. = A - P

Where,

A = Amount

P = Principal or Sum

T = Time

R = Rate

C.I. = Compound interest

Calculation:

The rate of interest is calculated half-yearly, 

R = 5% and T = 4 years

A = P(1 + R/100)T

⇒ A = 16000 × (1 + 5/100)4

⇒ A = 16000 × (21/20)4

⇒ A = 19448.1

Compound interest = Amount - Principal = 19448.1 - 16000 = 3448.1

∴ The compound interest is Rs. 3448.1.

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