Ross$-$Jordan Financial has suffered losses in recent years, and its stock currently sells for only $$0\mathrm{.}70$ per share. Management wants to use a reverse split to get the price up to a more "reasonable" level, which it thinks is $$21$ per share. How many of the old shares must be given up for one new share to achieve the $$21$ price, assuming this transaction has no effect on total market value?

Group of answer choices

$30\mathrm{.}60$

$25\mathrm{.}80$

$28\mathrm{.}50$

$30\mathrm{.}00$

$36\mathrm{.}30$