Are my answers correct?

25. You invested three thousands US dollars and purchased shares of a German corporation when the exchange rate was US$1.00 = 0.70 euro. After six months, you sold all of the shares for three thousand and one hundred euros, when the exchange rate was US$1.00 = 0.68 euro. No dividends were paid during the time you owned the shares of stock. What is the amount of gain or loss on this investment in US dollars? A) +$500 B)-$500 C) +$1,687 D) $1,687 *E) None of the given answers is correct 26. You purchased two hundreds shares of stock at nineteen dollars per share using her seventy percent margin account. Your maintenance margin is forty percent. You have no other securities in your account. How low can the price of each share be before you will have to add equity to the account? A) $9.1 B) $19.1 C) $16.7 D) $12.7 *E) None of the given answers is correct