The length and breadth of a rectangle are increased by 20% and 25% respectively. The increase in the area of the resulting rectangle will be:
1). 60%
2). 50%
3). 40%
4). 30%
Let L = 100
Let B = 1000
Area = 100000
Now L increased by 20% i.e. 120
and B increased by 25% i.e. 1250
Now New area is $\large 120 \times 1250 = 150000$
Increase in area = 50000
Hence % increase $\large = \frac{50000}{100000} \times 100 = 50%$
3. The height of an equilateral triangle is 15 cm. The area of the triangle is