Question discussion

If A lends Rs. 3500 to B at 10% p.a. and B lends the same sum to C at 11.5% p.a., then the gain of B (in Rs.) in a period of 3 years is

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If A lends Rs. 3500 to B at 10% p.a. and B lends the same sum to C at 11.5% p.a., then the gain of B (in Rs.) in a period of 3 years is
  • A107.5
  • B115.5
  • C157.5
  • D177.5
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Discussion 1

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CCommunity
We know that, formula for simple interest:

$(S.I. = \frac{{P \times R \times T}}{{100}})$

Where,

S.I. = Simple Interest

P= principal

T = Time

R = Rate of interest

Interest payable to A = 3500 × (10/100) × 3 = 1050

Interest payable to B = 3500 × (11.5/100) × 3 = 1207.5

The basic amount in both transactions is same. So, difference between interests in two transactions is the gain.

∴ B’s gain = amount B gets – amount B has to pay = 1207.5 – 1050 = 157.5