Answer
Every person would have 90 trillion ($9 \times 10^{13}$) dollars.
Work Step by Step
1. 1 mole of dollar bills: $6.022 \times 10^{23}$ dollars.
2. Just divide that number by 7 billion, which is $7 \times 10^9$.
$$\frac{6.022 \times 10^{23}}{7 \times 10^9} = 9 \times 10^{13}$$
thousand = 10^3
million = 10^6
billion = 10^9
trillion = 10^12
$9 \times 10^{13} = 90 \times 10^{12} = 90 $ trillion dollars.
