Exercise 1. A stock is worth $50 on december, 1st 2021. This price increases by 4% ou decreases by 4% every 2 months. The flat continuous rate of interest is 5% and the continuous rate of dividend is 2%. a) What is the premium of an American call on this stock with a maturity of 6 months and a strike price of $48? b) What is the premium of a European put on the stock? Maturity and strike price remain unchanged.