Google - In option. How many days from 21st March, 2017 to expire?

A call option on a stock has market price $2.20 today (21st of March 2017). The stock price is $15, the exercise price is $13, the volatility is 30% p

A call option on a stock has market price $2.20 today (21st of March 2017). The stock price is $15, the exercise price is $13, the volatility is 30% per annum and the risk free interest rate is 5% per annum. The option matures in April. How many days should I use?

or:A call option on a stock has market price $2.20 today (21st of March 2017). The stock price is $15, the exercise price is $13, the volatility is 30% per annum and the risk free interest rate is 5% per annum. The option matures in April. How many days should I use?

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