UOH doubts.

[Ashish]

Uoh 2009  
93) An economy is growing every year by 7.5 % and its population is growing by 1.5% every year ..then its Per capita income will double in approximately in?

A) 20 years
B) 15
C) 12
D) 9


94) if gdp is growing at g% per annum and population at p% per annum , then PCI must be growing at what %?

[Ashish]

can someone plz answer these question? plz its urgent...

[pp]

i think you use the doubling time formula i.e. 70/7.5=9.333 years but i'm confused how you would factor population growth in it