Final answer:
The speculator's annualized return on the wheat future, when purchasing at $10 with a 20% down payment and selling at $11 one month later, is 600%.
Step-by-step explanation:
The speculator bought a wheat future at $10 and paid 20% as margin, which is $2. The contract was later sold for $11, making a profit of $1 on the $2 investment. The annualized return is calculated by dividing the profit by the initial investment and then annualizing that figure:
Annualized return = (($1 / $2) * 100) * (12 months / 1 month)
Annualized return = (0.5 * 100) * (12 / 1)
Annualized return = 50% * 12
Annualized return = 600%
This calculation assumes the rest of the purchase was financed and the entire profit was made on the initial margin (the 20% downpayment).