8 + 5 = 13
13 + 2 = 15
50 + 9 = 59
25 + 59 = 84
15 x 84 = 1260

50 x 9 = 450
25 x 2 = 50
50 x 8 = 400
450 + 400 = 850
850 / 5 = 170