Calculating profits on margined and unmargined investments. Claire Gerber wants to

buy $300$ shares of Google, which is selling in the market for $$537\mathrm{.}34$ a share. Rather than

liquidate all her savings, she decides to borrow through her broker at $5$ percent a year.

Assume that the margin requirement on common stock is $50$ percent. If the stock rises to

$$625$ a share over the next year, calculate the dollar profit and percentage return that Claire

would earn if she makes the investment with $50$ percent margin. Contrast these figures to

what she'd make if she uses no margin.

Calculating return on investment. Which of the following would offer the best return on