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The side of square is increased by 10%. By what % does the area increase? |
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Answer» Answer: Step-by-step EXPLANATION: Original area. = a^2 New side = a + 10% of a = 1.1a New area = (1.1a)^2 = 1.21a^2 Increase in area = 1.21a^2 - a^2 = 0.21a^2 Increase% = 0.21a^2×100/a^2 = 21% Answer. (2)Another easiest technique/ Let side = 10 Original area = (10)^2 = 100 New side = 10 + 10% of 10 = 11 New area = (11)^2 = 121 Increase in area = 121-100 = 21 increase % = 21×100/100 = 21% Answer |
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