If the length of a rectangle is increased by 37\(\frac{1}{2}\)% and its breath is decreased by 20%, then find the percentage of change in its area.
Answer & explanation
Correct answer: option 1
+37.5% = \(\frac{11}{8}\)
-20% = \(\frac{4}{5}\)
change in length = 8--------11
change in width= 5---------4
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Total effect: 10--------11
change in area = \(\frac{1}{10}\) × 100 = 10% increase