The hypothetical figures in the table below give five alternate combinations of steel and autos that Japan and South Korea can produce it they fully use all factos of production at their disposal with the best technology available to them. After sketching the production possibilities schedules where steel is located on the vertical axis and autos on the horizontal axis for Japan draw a tangent line to Japan's autarky point (600,500). What will be the slope of this tangent line?

Japan South Korea
Steel Autos Steel Autos
520 0 1200 0
500 600 900 400
350 1100 600 650
200 1300 200 800
0 1430 0 810