Question

The side of a rectangle are 20 cm and 15cm. If each side is increased by 20% , find the percentage increase in the area.​

Answer 1

Step-by-step explanation:

if it increases from all side by 20% then it's% of area increases is also 20%

I hope it will help

Answer 2

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STEP 1 :- Find the area of the rectangle:

Area = Length x Breadth

Area = 20 x 15 = 300 cm²

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STEP 2 :- Find the new length and breadth:

Increase in length = 20% x 20 = 0.2 x 20 = 4 cm

New Length = 20 + 4 = 24 cm

Increase in breadth = 20% x 15 = 0.2 x 15 = 3cm

New Breadth = 15 + 3 = 18 cm

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STEP 3 :- Find new area:

Area = Length x Breadth

Area = 24 x 18 = 432 cm²

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STEP 4 :- Find the percentage increased:

Area increased = 432 - 300 = 132 cm²

Percentage increased = 132/300 x 100 = 44%

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Answer :- The area increased by 44%

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