If the simple interest on a certain amount in at 4% rate 5 years amounted to Rs.2400 less than the principal. What was the principal? Options:  A) 1500  B) 2500  C) 2507  D) 3000  E) 11500

Rationale: "p - 2400 = ( p * 5 * 4 ) / 100 p = 3000 answer : d"
Answer: D