The difference between the compound interest compounded annually and simple interest for 2 years at 20% per annum is Rs.72. Find the principal?	Choose the correct choice from the following answers.
A) 2277	B) 2667	C) 3600	D) 2766	E) 1800

Rationale: "p = 72 ( 100 / 5 ) ^ 2 = > p = 1800 answer : e"
Answer: E