A man takes a loan of some amount at some rate of simple interest. After three years, the loan amount is doubled and rate of interest is decreased by 2%. After next 5 years, if the total interest paid on the whole is Rs. 13,600, which is equal to the same when the first amount was taken for \(11 \frac 1 3\) years, then the loan taken initially is:

• A. Rs. 12,000
• B. Rs. 12,500
• C. Rs. 13,600
• D. Rs. 10,000