A portfolio manager at a hedge fund is using the Merton model to evaluate the risk level of a company that does not pay dividends, where the equity shares of the company are part of the fund's portfolio. The manager has conducted an initial assessment of the company and obtained the following data:

• Equity value: USD 45 million
• Single debt of the company maturing in 5 years: USD 60 million
• $d1: 3.217790$
• $d2: 3.038905$

Assuming a constant volatility for the company's value, what would be the calculated volatility?