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Let length of rectangle = $$l$$ cm and breadth = $$b=20$$ cm
Perimeter of rectangle = $$2(l+b)=90$$
=> $$l+20=\frac{90}{2}=45$$
=> $$l=45-20=25$$ cm
$$\therefore$$ Area of rectangle = $$lb$$
= $$25\times20=500$$ $$cm^2$$
=> Ans - (A)
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