Rita is at the grand opening celebration of a supermarket. She spins a wheel with 10 equal-sized slices, as shown below. The wheel has 3 black slices, 3 grey Slices, and 4 white slices. When the wheel is spun, the arrow stops on a slice at random. If the arrow stops on the border of two slices, the wheel is spun again
(a) if the arrow stops on a black slice, then Rita wins a gift card, find the odds in favor of Rita winning a gift card

(b) If the arrow stops on a black slice, then Rita wins a gift card. Find the
odds against a winning a gift card