To fully comprehend and solve the task at hand, let's delve into some background information on the key concepts involved:

In the context of derivatives trading, a European-style call option is a type of financial contract that provides the buyer with the right, but not the obligation, to purchase the underlying asset at a specified strike price on the option's expiration date. In this scenario, we need to analyze the credit exposure faced by the counterparty involved in selling such an option. Credit exposure refers to the risk of financial loss that the counterparty could face if the trading firm defaults on the agreement.

Let's consider the following specific details provided:

• Option Type: European-style call option
• Underlying Stock: JKJ
• Expiration: 9 months from the current date
• Strike Price: EUR 45
• Current Asset Price: EUR 67
• Implied Volatility: 27%
• Annual Risk-Free Rate: 2.5%

Using these details, calculate the credit exposure to the trading firm's counterparty in this transaction.