Question

The side of a rectangle are 15cm and 10cm. If each side is increased by 40%, find the percentage increase in area?

Answer 1

The req. Are of the given rectangle=l×b
=15×10cm²
=150cm²
Length after increased =15+15×40÷100cm
=15+15×2/5cm
=15+6cm
=21cm
Breadth after increased =10+10×40÷100cm
=10+10×2/5cm
=10+4cm
=14cm
The new area =21×14cm²
=294cm²
Increase in area=294-150cm²
=144cm²
Percentage increase=144/150×100%
=144/3/2
=48×2%
=96%

Answer 2

Here is your answer.

Area of the original rectangle = 15× 10 cm
= 150 cm^2
Increased Length = 15 + (40/100×15) cm
= 21 cm
Increased Breadth = 10 + (40/100×10) cm
= 14 cm
Increased Area = 21 × 14 cm^2
= 294 cm^2
Increased % in the area = (294-150)/150 × 100
= 96 %

HOPE THIS HELPS YOU.