Shares $1,000$

Initial margin req $50\%$

Maintenance margin req $30\%$

broker call rate $7\mathrm{.}25\%$

You took out a margin loan and bought a stock for $$10$ a share. You sold the stock $18$ months later at $$20$ a share. What was your return?

a $18\mathrm{.}91\%$

b None of the answers is correct

c $189\mathrm{.}1\%$

d $$1\mathrm{.}891$