The simple interest on a sum of money will be Rs.400 after 10 years. If the principal is trebled after 5 years what will be the total interest at the end of the tenth year?	Select the correct option:  A) 800  B) 3799  C) 1200  D) 2693  E) 1732

Rationale: "p - - - 10 - - - - 400 p - - - 5 - - - - - 200 3 p - - - 5 - - - - - 600 - - - - - - = > 800 answer : a"
Answer: A