In the new gold mining area in Davao, the ore contains, on average 1 ounce of gold per ton. One method of processing A costs P1,500/ton and recovers 90% of the gold. Another method B costs only P1,200/ton and recovers 80% of the gold. If gold can be sold at P4,000 per ounce, What is the difference in the net income per ton between the two methods?