"10\\times90=900"
Note that the mid-market price is halfway between the offer price and the bid price.
The mid-market of the position in the commodity is;
"50\\times15.05=752.5"
The proportional bid-offer spread for the position of the shares is equivalent to
"s=\\frac{offer price-bid price}{mid-market price}=\\frac{90.5-89.5}{90}=0.0111"
Similarly, the proportional bid-offer for the position in the commodity is:
"s=\\frac{offer price-bid price}{mid-market price}=\\frac{15.1-15}{15.05}=0.0066"
And hence the cost of liquidation in a normal market is:
"900\\times0.0111\\times0.5+752.5\\times0.0066\\times0.5=4.995+2.48325=7.47825"
2.
The face value of the protection is K1, 000,000 million, rate 0.04
The protection buyer makes monthly payments
"P=K\\times r\\times k"
"k=\\frac{6}{6\\times12}"
year count in months
"1 000 000\\times 0.04\\times\\frac{6}{6\\times 12}=3 333.33"
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