A sum fetched a total simple interest of Rs. 100 at the rate of 5 p.c.p.a. in 4 years. What is the sum?	Options.
A) 800 B) 600 C) 500 D) 1000 E) 300
Sol.   Principal = Rs. [100 * 100 / 5 * 4] = Rs. [10000 / 20] = Rs. 500.   Answer 500
<result>C</result>
A sum fetched a total simple interest of Rs. 100 at the rate of 5 p.c.p.a. in 4 years. What is the sum?