If each year the population of the country grows by 20%, how many years will elapse before the population of the country doubles?	Choose the correct choice.
A) 3 B) 4 C) 5 D) 6 E) 7
Till Year 2000, population is 100 .   Year 2001: Population becomes 120 ............. 1 Year elapsed   Year 2002: Population becomes 144 ............. 2 Year elapsed   Year 2003: Population becomes 172 ............. 3 Year elapsed   Year 2004: Population &gt; 200 .................. 4 year elapsed   Answer:4
<result>B</result>
If each year the population of the country grows by 20%, how many years will elapse before the population of the country doubles?