How to solve

Your friend Frenny deposits $$340,000$ cash in a brokerage in order to short sell $$420,000$ of stocks on margin. The broker requires a maintenance margin the value of the stocks held short rises to $$454,000.$ What is the new account margin in percent? Will there be a margin call? $82\mathrm{.}38\%,$ No

$49\mathrm{.}78\%,$ No

$72\mathrm{.}9\%,No$

$67\mathrm{.}4\%,$ No