Question

Two sides of rectangle are 10 cm and 8 cm, respectively. They are increased by 15 percent and 20 percent , find the percentage increase in the area.

Answer 1

Answer:

Answer= 38%

Step-by-step explanation:

length of new rectangle will be 10 + 15%of10 = 10 + 1.5 = 11.5 cm = L

breadth of new rectangle= 8 + 20% of 8 = 8 + 1.6 = 9.6 cm=B

Area of new rectangle = L*B = 11.5 * 9.6 = 110.4 cm^2

Percentage increased in area :

area of new rectangle - area of old rectangle /area of old rectangle * 100 = 110.4-80/80 * 100 =30.4/80 *100 =38%