Rebecca would like to purchase a stock on margin in her margin account. Currently, the stock she is considering is trading at $10 per share and she would like to purchase 1000 shares. What is her margin requirement if the margin rate is 45 percent and her brokerage firm is willing to lend her 55 percent of her purchase price? $3,240 $8,000 $4,900 $1.875 $4.500