The length of a rectangle is increased by and its breadth is decreased by . What is the net percentage change in the area of the rectangle?
Answer and explanation
Correct answer: B.
- Step 1: Net percentage formula is with and .
- Step 2: Net change = .
- Step 3: The area increases by .
Answer
.
Why not the others: adds directly without interaction; reverses the sign; and adds the cross-term.
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