A - 24,000, B-22,000, C-20,000, D-18,000 ..................................L-2000
T= 12 11 10 9 1
D's profit:L's profit = 18000x*9 : 2000x*1
Difference = 72000
1,62,000x - 2000x = 72,000
1,60,000x = 72,000
x = 0.45
Total profit = 2000(12 +22 +32+ 42 .......122)*0.45
Total Profit = 2000*650*0.45 = 5,85,000