The population of a town is 30000. It decreases annually at the rate of 20% p.a. What will be its population after 2 years?  Pick one
A) 4300	B) 19200	C) 5120	D) 5230	E) 5366

Rationale: "30000 × 80 / 100 × 80 / 100 = 19200 answer ; b"
Answer: B