The cost and revenue functions of a product are given by \( C(x)=20...

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The cost and revenue functions of a product are given by \( C(x)=20 x+4000 \) and \( \mathrm{R}(x)=60 x+2000 \) respectively, where \( x \) is the number of items produced and sold. How many items must be sold to realise some profit?
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