The manager of the video department at Target plans to purchase a large number of DVDs of The Lego Movie. One supplier is selling boxes of 20 DVD movies for $240, and a second supplier is selling boxes of 12 DVD movies for $180. Only complete boxes of DVD movies can be purchased.

(a) If the manager can purchase boxes of DVD movies from either or both suppliers, determine the maximum number of DVD movies that can be purchased for $425. Indicate how many boxes of 20 and how many boxes of 12 will be purchased.

(b) How much will the DVD movies cost?