You have decided to use futures contracts to invest in silver at a settle price of $15 per ounce. Each futures contract has a standard size of 4,400 troy ounces and an initial margin requirement of $3,900. What is the leverage factor associated with these contracts? (Enter your onswer rounded to 2 decimal places.) If silver rises to $17 per ounce, what is your total percentage return? (Enter your answer as a percent rounded to the nearest whole number.)