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The difference between the simple interest and compound interest(compounded half-yearly) on a certain sum at 10% per annum for one year is ₹ 100. The
Question

The difference between the simple interest and compound interest(compounded half-yearly) on a certain sum at 10% per annum for one year is ₹ 100. The principal sum is equal to

A.

₹ 30,000

B.

₹ 10,000

C.

₹ 20,000

D.

₹ 40,000

Correct option is D

Given:
Difference = ₹100
Time = 1 year
Rate = 10% per annum, compounded half-yearly
Formula Used:
When compounded half-yearly, Rate R' =R2 \frac{R}{2}​, Time T' = 2T.
Difference for 2 periods = P(R100)2P(\frac{R'}{100})^2​​
Solution:
Effective rate per half-year = 102=5%\frac{10}{2} = 5\%​​
Number of half-years = 1 × 2 = 2
The SI for 1 year is equivalent to SI for 2 half-years at 5%.
The difference between CI and SI for 2 periods is given by P(5100)2.P(\frac{5}{100})^2.​​
100=P(120)2100 = P(\frac{1}{20})^2​​
100 = P×1400P × \frac{1}{400}​​
P = 100 × 400 = 40000
Final Answer
So the correct answer is (d)

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