Question

Karan deposited a certain amount of money at 6% per annum .The bank increases the rate of interest
from 6% to 7%. Karan deposits 4000 more in his account . The annual interest received by him now is 4000
more than before .Find his original deposit.

Answer 1

Answer:

Let sum deposited by karan in bank x ₹

Rate of interest= 6% per annum

Now

the annual interest on x₹ is given by

I = x×6/100

I=6x/100 (1)

Now Rate of interest R'=7%per annum

and sum deposited by karan in his account= (x+4000) ₹

I'= (x+4000) ×7/100

I'=7x+4000×7/100

I'=7x/100+28000/100

I'= 7x/100+280 (2)

from 1 and 2

I'= I +4000

7x/100+280= 6x/100+ 4000

7x/100-6x/100= 4000-280

7x-6x/100=3720

x/100=3720

x=3720×100

x=372000₹

therefore his original deposite is 372000₹

Step-by-step explanation:

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