The population of a town is 8000. It decreases annually at the rate of 30% p.a. What will be its population after 2 years? Options:	A) 3920	B) 5120	C) 5200	D) 5400	E) 5500

Rationale: "formula : ( after = 100 denominator ago = 100 numerator ) 8000 ã — 70 / 100 ã — 70 / 100 = 3920 answer : a"
Answer: A