$20000 will become $60000 at 20% P.A. find the time?  Choose the correct choice from the following answers.
A) 2years B) 5years C) 7years D) 8years E) 10years
SI = simple interest = A-P = 60000-20000= 
<gadget id="calculator">60000-20000</gadget>
<output>40_000</output>
$40000   R= 100SI/PT = 100*40000/20000*20 =10 years   Answer is 10years
<result>E</result>
$20000 will become $60000 at 20% P.A. find the time?