A country has a population of 61 million and a Gross National Product (GNP) of 4.3 trillion euros. (You should use the UK and US versions of million and trillion.)

Which of the following gives the GNP per person in scientific notation correct to 3 s.f.?

Select one:

$\displaystyle 7.049x10^4 $

$\displaystyle 7.05x10^19$

$\displaystyle 7.05x10^4$

70500

$\displaystyle 0.705x10^5$

Again any explanation would be welcome. I can get the GDP per person simply enough by using Google to divide 4.3 trillion by 61 million

I did this like this4.3 x (10^12)) / (6.1 x (10^5)) = 7 049 180.33. But this is where I get lost. How do you round this number off to 3 Sf and what's the right answer?