Find the principle on a certain sum of money at 5% per annum for 3 1/5 years if the amount being Rs.580?	Choose the correct choice:
A) rs . 500  B) rs . 5100  C) rs . 530  D) rs . 540  E) none of these

Rationale: "explanation : 580 = p [ 1 + ( 5 * 16 / 5 ) / 100 ] p = 500 answer : option a"
Answer: A