1. Station master decides that the length and the breadth of the rectangular Digital Board should be increased by 8% and decreased by 2% respectively. Find the overall change in the area.
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By: anil on 05 May 2019 01.13 am
Let the length and breadth of rectangle be 100 cm => Original area = $$100 imes100=10000$$ $$cm^2$$ Increasing the length by 8%, => new length = $$100 imesfrac{108}{100}=108$$ cm Similarly, new breadth = $$98$$ cm => New area = $$108 imes98=10584$$ $$cm^2$$ $$ herefore$$ Area is increased by = $$frac{10584-10000}{10000} imes100=5.84\%$$ => Ans - (D)
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