calculate the time required to become sum 2 times of itself at rate of 10%.  Choose the correct choice from the following options:
A) 5year B) 15year C) 10year D) 8year E) 12year
if sum become 2 time then simple interest equal to x.   x=x*10*t/100   t=100/10= 
<gadget id="calculator">100/10</gadget>
<output>10</output>
10year   answer 10year
<result>C</result>
calculate the time required to become sum 2 times of itself at rate of 10%.