If the length of a rectangle is increased by 12% and the breadth is decreased by 8%, the net effect on the area is:

Answer: Option A

Solution

Answer: Option A

Solution:

$$\begin{array}{rl}& 12\%\to \frac{+3}{25}\\ & 8\%\to \frac{-2}{25}\\ & \text{Length}\to 25:28\\ & \underline{\text{Breadth}\to 25:23}\end{array}$$

$$\text{Increase }\%=\frac{19}{625}\times 100=3.04\%$$