Question

The width of a square increases by 30%. By what percent does its area increase?

Answer 1

Answer:

30%

Step-by-step explanation:

Let the length be L units and the Width be W units.

Area of rectangle = L * W

New Width = (W + 30% of W) = W + W * 30/100 = (1 + 0.3) W = 1.3W

New area = L * 1.3W = 1.3 L * W

Increase in area = 1.3 L W - L W = L W (1.3 - 1) = 0.3 * L *W

So, the area increase by 0.3 * 100 = 30%