Binary Digit & Decimal value

can someone check if I did this correctly

Quote:

the human genome contains about 3 billion base pairs...stored in a computer as a sequence of $\displaystyle 3*10^9$ bases X 2 bases/bits = $\displaystyle 6*10^9 bits$

Quote:

The Encyclopedia Britannica has about 1500 words per page, 1000 pages per volume and 30 volumes. How many sets of the Encyclopedia Britannica would it take to store the same amount of info in a single strand of human dna?

$\displaystyle

1500*1000 = 1,500,000 = 15*10^5$

$\displaystyle (15*10^5)*30 = 45,000,000 = 45*10^6$

$\displaystyle (45*10^6)base * 2(bits/base) = 9*10^7 bits$

$\displaystyle \frac{(6*10^9 bits)}{9*10^6} = 66.67 $