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From the table below

Economics

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From the table below. what is the equilibrium Y? 
Y C I 0 XX $200 $240 S40 SO SO 300 300 40 0 0 400 360 40 0 0 500 420 40 0 0 600 480 40 0 0 700 540 40 0 0 800 600 40 0 0 
O 300 O 400 O 500 O 600