Arjun and Chelsea each improved their yards by planting daylilies and ornamental grass. They bought their supplies from the same store. Arjun spent $114 on 7 daylilies and 12 bunches of ornamental grass. Chelsea spent $84 on 8 daylilies and 6 bunches of ornamental grass. Find the cost of one daylily and the cost of one bunch of ornamental grass.