Question:The length of a rectangle is increased by 60% and the width is decreased by 20%. The area decreases by :
A3712%
B60%
C75%
D None
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+ Answer
A
+ ExplanationLet length = l and breadth = b
Let the required decrease in breadth be x%.
Then,160100l×(100-x)100×b=lb⇒160(100-x)=100×100or100-x=10000160=1252⇒x=(100-1252)=3712.