Explain what it means for a forward currency to sell at a discount and at a premium.

Explain what it means for a forward currency to sell at a discount
and at a premium.
Suppose a U.S. firm must pay 200 million Swiss francs to a Swiss
firm in 90 days. Briefly explain how the firm would use forward
exchange rates to “lock in” the price of the payable due in 90 days.