I don't mean to be picky, but I want to be sure of the numeric goals.
In U.S., 10^9 = $1,000,000,000 is one billion, not one trillion (and in U.K. I believe it is one thousand million, not one trillion)
In U.S., 10^12 = $1,000,000,000,000 is one trillion.
In U.K., I believe, 10^15 = $1,000,000,000,000,000 is one trillion
Is the goal for questions 3 and 4 based on 10^9, 10^12, or 10^15?