Question

8. The length and breadth of a rectangle is 80 m and 40 m, respectively. If the length increases by 5%
and the breadth decreases by 5%. What will be the difference in perimeter?
(1) 20 m
(2) 12 m
(3) 15 m
(4) 4 m
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Answer 1

Answer:

(4) 4

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Answer 2

The perimeter of the original rectangle is 2(80 +40) or 240m. if the length is INCREASED by 5% then it is now 1.05 * 80 or 84m on a side. and the breadth is 0.95 * 40 or 38m per side. The perimeter of the new rectangle is 2(84+38) or 244m. Subtracting the two perimeters, the second one is 4 meters longer.

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