The stock of Harford Inc. is about to pay a $0.30 dividend. It will pay no more

Question:

The stock of Harford Inc. is about to pay a $0.30 dividend. It will pay no more dividends for the next month. Consider call options that expire in one month. If the interest rate is 6% APR (monthly compounding), what is the maximum where it could be possible that early exercise of the call option is optimal? (Round to the nearest dollar.)

Strike Price
In finance, the strike price of an option is the fixed price at which the owner of the option can buy, or sell, the underlying security or commodity.