Answer:
36.19%
Step-by-step explanation:
The value of stock purchase=400*$16=$6400
Initial margin=60%*$6400 =$3840
margin loan=$6400 -$3840 =$2560
interest on margin loan=$2560 *6.65%*7/12=$99.31
return on the sale of shares=($18*400)-$6400 -$99.31=$700.69
seven-month return=$700.69 /$3840 =18.25%
annualized return=(1+18.25% /7)^12-1=36.19%