David borrowed a sum of \(₹\)3855 from a bank at 15\(\%\) per annum for one year. Calculate the interest and amount to be paid at the end of 3 years.
The simple interest \((I) = ₹\).
[Note: Insert the answer as a whole number].
The amount to be paid at the end of 3 years \((A) = ₹\).
[Note: Insert the answer as a whole number].