Math, asked by ishratbano356, 2 months ago

Mr Gupta had a recurring deposit account. He deposited 140 per month at 10% per annum. If he received * 1372 as interest at the time of maturity, find the total time for which the account was held.​

Answers

Answered by amitnrw
3

Given :  Mr Gupta had a recurring deposit account.

He deposited 140 per month at 10% per annum.  

he received  1372 as interest at the time of maturity,

To Find  :   the total time for which the account was held.​

Solution:

SI = P * R * T /100

P = Amount Deposited = 140  per month

R = Rate of interest  = 10 % per annum

T = Time period  in years

SI = Simple interest

Interest for 1 month  = 140 * 10  * (1/12) /100  =  14/12  Rs

Let say deposit for n months  Then interest = n(n + 1)/2    *   interest 1 month

=  (14/12) n(n + 1)/2  = 1372

=> n(n + 1)  =  2352

=> n( n + 1) = 48(49)

=> n = 48

Account held for 48 months =  4 Years

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