A stock is currently selling for $52. In one period, the stock will move up by 1.15

Question:

A stock is currently selling for $52. In one period, the stock will move up by 1.15 or down by .87. A call option with a strike price of $50 is available. If the risk-free rate of interest is 2.5 percent per period, what is the value of the call option?

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.