A small island country of 5000 people has an emigration and immigration statistic per 500 persons of 50.4 and 15.4 respectively. How long will it take for the population to be half of its current number.  Choose the correct choice from the following choices
A) 6.8	B) 8.5	C) 6.1	D) 9.1	E) 7.14

Rationale: annual decrease is ( 500 + 15.4 - 50.4 ) * 10 = 4650 hence every year there is a decrease of 350 for the population to become half 2500 must emigrate therefore 2500 / 350 = 133.3 correct option is e ) 7.14
Answer: E