$41$ point $$

A CD$-$ROM disk can store approximately $600\mathrm{.}0$ megabytes of information. If an average word requires $8\mathrm{.}0$ bytes of storage, how many words can be stored on one disk?

$2\mathrm{.}0{10}^9$ words

$5\mathrm{.}4{10}^9$ words

$7\mathrm{.}5{10}^7$ words

$2\mathrm{.}1{10}^7$ words