问一道题：NO.PZ2020012001000026

问题如下：

How is the number of contracts that should be used calculated from the optimal hedge ratio? Assume that the optimal hedge ratio is calculated from actual, rather than proportional, changes in the asset price and the futures price.

选项：

解释：

The number of contracts that should be used is $h^*Q_A/Q_F$, where h* is the optimal hedge ratio, $Q_A$ is the number of units of the asset being hedged, and $Q_F$ is the number of units of the asset underlying a futures contract.