By what percentage will the transmission range of a T.V. tower be affected when the height of the tower is increased by 21% ?

Explanation

To solve the problem of how the transmission range of a T.V. tower is affected by a 21% increase in the height of the tower, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the formula for transmission range**:
The transmission range \( D \) of a T.V. tower is given by the formula:
\[
D = \sqrt{2 \cdot h \cdot R}
...