Response:
After one year, the simple interest on the specified principal amounts to Rs. 1,000
The total sum Rishav will need to settle after one year is Rs. 11,000
Detailed explanation:
The principal amount borrowed is Rs 10,000
Interest Rate = 10%
Duration = 1 year
Now, the SIMPLE INTEREST = 
or, 
Therefore, the calculated simple interest on the principal after 1 year is Rs. 1,000
Next, Total Amount = Principal + Simple Interest
or, A = 10,000 + 1,000 = 11, 000
Thus, the amount Rishav has to pay after one year is Rs 11,000