a$.$ What alternative investment has the lowest possible volatility while having the same expected return as Amazon?

To create an alternative investment that has the lowest possible volatility while having the same expected return as Amazon, we use the

following strategy:

Sell:

$ worth of Amazon stock. $($Round to the nearest dollar.$)$

Borrow: $ at the risk$-$free rate. $($Round to the nearest dollar.$)$

Buy: $ worth of the market portfolio. $($Round to the nearest dollar.$)$

Buy: $,$$ worth of the risk$-$free investment. $($Round to the nearest dollar.$)$