A sum fetched a total simple interest of Rs. 1000 at the rate of 10 p.c.p.a. in 4 years. What is the sum? Choose the correct choice from the following choices.
A) 2500
B) 2800
C) 3500
D) 1900
E) 1500

Rationale: sol . principal = rs . [ 100 * 1000 / 10 * 4 ] = rs . [ 100000 / 40 ] = rs . 2500 . answer a
Answer: A