Question

two sides of a rectangle are 20 and 30cm.They are increased by 10% and 5% respectively.Find the percentage increase in it area

Answer 1

20 is to 22,30 is to 31.5 cm

Answer 2

Hey there your answer



$sides \: are = 20cm \: and \: 30cm \\ area = 20 \times 30 = 600 {cm}^{2} \\ sides \: after \: increaed = \\ \: \: \: \: \: \: 20 + 10\%of20 = 22cm \\ and = 30 + 5\%of30 = 31.5cm \\ \\ area \: of \: new \: rectangle = \\ \: \: \: \: \: \: \: \: \: \: \: \: 22 \times 31.5 = 653 {cm }^{2} \\ \\ increased \: \% in areas = \frac{653}{600} \times 100 \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 108.833\%$


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