How long will it take for a sum of money to grow from Rs.1000 to Rs.5,000, if it is invested at 20% p.a simple interest?	Select the correct option:
A) 8 years	B) 20 years	C) 72 years	D) 56 years	E) None
In this case, Rs. 1000 has become Rs.5000.   Therefore, the interest earned = 5000 – 1000 =4000   Interest for Rs 1000 @ 20% for 1 year = 200   200 - 1   4000 - ? =&gt; 20 years   Answer : 20 years
<result>B</result>
How long will it take for a sum of money to grow from Rs.1000 to Rs.5,000, if it is invested at 20% p.a simple interest?