11. At a certain rate % Rs 4000 amounts to Rs 5000 in 4 years on Compound Interest. Find the amou
for the same sum afte

1 thought on “<br />11. At a certain rate % Rs 4000 amounts to Rs 5000 in 4 years on Compound Interest. Find the amou<br />for the same sum afte”

1. Step-by-step explanation:

   Let the rate of interest is r% p.a.

   A= P.(1+r/100)^t.

   5000 = 4000.(1+r/100)^4.

   or , (1+r/100)^4 = (5/4) …………………..(1)

   A = 4000.(1+ r/100)^12.

   = 4000.{ (1+r/100)^4}^3. , putting (1+r/100)^4 = 5/4 from eqn. (1).

   = 4000.{ 5/4 }^3.

   = (4000×125)/64.

   = (125×125)/2. = ₹ 7812.50. , Answer.

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