The contract size for platinum futures is 50 troy ounces. Suppose you need 400 troy ounces of platinum and the current futures price is $1,335 per ounce. How many contracts do you need to purchase? How much will you pay for your platinum? What is your dollar profit if platinum sells for $1,375 a troy ounce when the futures contract expires? What if the price is $1,280 at expiration?