You have a portfolio tracking the performance of the FTSE100 index. To hedge your position, you plan to use 10 futures contracts. The current level of the index is 900. The March futures exercise price is 905. Every one point in a futures contract is equal to 100. You are concerned that the market may fall to 800 points in March. Are you going to buy or sell the futures contracts to hedge your portfolio against the price fall? How much is your profit or loss when the spot price of the index in March reached 850? (Show one equation with the result, use a comma to separate answers)