Answer :

Time taken for principal to amount to 20000 is 270 months .

Given,

Principal = 12000

Amount = 20000

Rate of interest = 2.3% compounded monthly.

Now,

C I = 20000-12000

C I = 8000

Formula for compound interest calculated monthly,

A = P(1 + (r/12)/100)^12t

Substitute the data,

20000 = 12000 (1 + (2.3/12)/100)^12t

t≅ 270 months.

Hence the required time is approximately 270 months.

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