Each side of a square garden is increased by 30%. By what percentage does the area of the garden increase?

Explanation

1. 01

   Area multiplies by $1.3 \times 1.3 = 1.69$.

2. 02

   So the area increases by 69%. (Formula: $30 + 30 + \frac{30 \times 30}{100} = 69$.)