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Let the length and breadth of the rectangle be 14x and 11x respectively. So perimeter of the rectangle = 2(14x+11x) = 50x cm. So, 50x= 150 x=3cm So length and breadth of the rectangle are 42cm, and 33cm So area of the rectangle.= 42*33 = 1386 sq.cm 3.14* radius2 = 1386sq.cm Radius = 21 cm and height = 21/2 = 10.5cm So curved surface area= 2*(22/7)* 21*20 = 2640sq.cm Quantity 2: Let the cost price of the articlr = Rs. 10y As per the querstion 100y*1.44 -144= (100y+190)*0.75+24 144y-144 =75y+142.5+24 Y= 310.5/69 = 4.5 And so the cost price of Article = 4.5*100 = Rs. 450 Desired selling price = 450*1.2 =Rs. 540
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