Q gets 2/7 of the profit. P gets(1 - 2/7) = 5/7 of the profit P : Q = 5/7 : 2/7 = 5 : 2Let the contribution of Q be a. Then, 8000 x 8 : a x 4 = 5 : 2 64000/4a = 5/2 20a = 128000 a = 128000/20 = 6400