Ratio between the investment of Subodh and Nepal = (45000 x 12) : (30000 x 8)
= 540000 : 240000 = 9 : 4
Total profit = Rs. 13000
∴ Subodh's share = 9/(9 + 4) x 13000 = Rs. 9000
∴ Nepal's share = 13000 - 9000 = Rs. 4000
∴ Required difference = 9000 - 4000 = Rs. 5000