To show that English grammar is not simple. Crystal provides an example of an English grammar book that contains $...$

$800$ pages and $500$ entries.

$1\mathrm{.}000$ pages and $2\mathrm{.}000$ entries.

$1\mathrm{.}800$ pages and $3\mathrm{.}500$ entries.

$2\mathrm{.}800$ pages and $5\mathrm{.}000$ entries.