Find the principle on a certain sum of money at 5% per annum for 2 2/5 years if the amount being Rs.1792?  Choose the correct answer:
A) 1600  B) 2777  C) 2889  D) 27670  E) 2771

Rationale: "1792 = p [ 1 + ( 5 * 12 / 5 ) / 100 ] p = 1600 . answer : a"
Answer: A