An investor has purchase $300$shares on margin for $$45/$share$.$The initial margin was $70\%.$How much money did the investor borrow to create the initial position? $($express in dollars, omit the dollar sign$).$If the maintenance margin is $35\%,$what price would the stock have to fall to to trigger a margin call? $($Express in dollars, round to the nearest whole cent$).$If the stock price falls to $$15,$how much will the investor have to contribute to return to a $35\%$maintenance margin? $($Express in dollars, omit the dollar sign, round to the nearest whole cent$).$If the price fell to $$15$and the investor sold the stock and closed the position, what was the investor's return $($Express as a percentage to two decimals, omit the percentage sign$)$