Given: (x is number of items)
Demand function: d(x)=672.7−0.3x2\displaystyle {d}{\left({x}\right)}={672.7}-{0.3}{x}^{{2}}
Supply function: s(x)=0.4x2\displaystyle {s}{\left({x}\right)}={0.4}{x}^{{2}}

Find the market demand:  

Find the consumers surplus at the market demand:  

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