Answer:
The rate of return on the investment if the price fall by 7% next year is -22% which is shown below.
The price of Telecom would have to fall by $71.43($250-$178.57), before a margin call could be placed.
Lastly,if the price fall immediately,the margin price would $178.57 as shown below
Explanation:
Total shares bought=$40000/$250=160 shares
Interest on amount borrowed=8%*$20000=$1600
When the price falls by 7% the new price =$250(1-0.07)=$232.50
Hence rate of return=(New price*number of shares-Interest-total investment)/initial investor's funds
=($232.50*160-$40000-$1600)/$20000=-22%
Initial margin=investor's money/total investment=$20000/$40000=50%
maintenance margin=30%
Margin call price=Current price x (1- initial margin)/ (1- maintenance margin)
=$250*(1-0.5)/(1-0.3)
=$178.57