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-178800
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-178800
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1200-\frac{600\times 600}{2}
Add 600 and 600 to get 1200.
1200-\frac{360000}{2}
Multiply 600 and 600 to get 360000.
1200-180000
Divide 360000 by 2 to get 180000.
-178800
Subtract 180000 from 1200 to get -178800.
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