If the length of a rectangle is increased by 30% and its breath is decreased by 40%, then find the percentage of change in its area.
Answer & explanation
Correct answer: option 3
+30% = \(\frac{13}{10}\)
-40% = \(\frac{3}{5}\)
change in length = 10--------13
change in width= 5---------3
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Total effect: 50--------39
change in area = \(\frac{11}{50}\) × 100 = 22% decrease