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.
A) 800 B) 3799 C) 1200 D) 2693 E) 1732
P --- 10 ---- 400   P --- 5 ----- 200   3P --- 5 ----- 600   ------   =&gt; 800   800nswer: 800
<result>A</result>
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?