We multiply them by one another and we basically get one fourth which is equivalent to zero point 25. And if we multiply by 100 we get 25%. So remember this is zero point 25 out of one or equivalently 25%. Now we can also use a Punnett square to basically calculate what the result is. So in trial number one in the first event we can either get heads or we can get tails. So let's use I guess red for heads or actually let's use red for event number one and let's use blue for event number two.