Question 11. You want to buy $100,000 worth of SPDR ETFs but you only have $60,000. Your broker allows you to borrow $40,000 using your $60,000 position in SPDR ETFs as collateral. a) How large is your initial margin, in percent? b) What is your Return on Equity, in percent, if the price falls by 12%? c) After two months, when your total position in the SPDR ETF is worth $80,000, you receive a margin call. What is the maintenance margin