Two artisans are going to make Halloween yard decorations. It takes Keyanna 1 hour to make a ghost and 1 hour to make a bat. Keyanna has at most 50 hours available per week. Darius needs 20 minutes to paint a ghost and 40 minutes to paint a bat. Darius has at most 1600 minutes available per week. If each Ghost brings in a profit of $90, and a bat yields a profit of $30, how many of each decoration should they make in order to maximize profit?