Scottie believed Apple Co$.($AAPL$)$ stock was overpriced at the price of $$115.$ She shorted $45$ shares. The brokerage firm required an initial margin of $55\%$ and maintenance margin of $30\%.$ The price, however, has been moving against Scottie's belief. If AAPL price increases from $$115$ to $$139\mathrm{.}50,$ how much would Scottie have to deposit in her margin account? $q,$

$$(139\mathrm{.}5-115)$ times $45$

$$139\mathrm{.}50$

$$137\mathrm{.}12$ times $45$

$$0,$ because the price hasn't reached the threshold yet.