Pls help

The manager of the video department at a department store plans to purchase a large number of DVDs of a recent movie. One supplier is selling boxes of 20 DVD movies for $250, and a second supplier is selling boxes of 12 DVD movies for $170. Only complete boxes of DVD movies can be purchased. Complete parts a) and b) below. 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 $445. Indicate how many boxes of 20 and how many boxes of 12 will be purchased. box(es) of 20 and box(es) of 12