A school has three workers: Aku, Brako, and Dagadu, with monthly incomes of GH¢ 5,000.00, GH¢ 6,500.00, and GH¢ 4,200.00 respectively. Calculate their yearly incomes, the difference between Aku's and

$$
\text{Aku's yearly income} = \text{GH¢ } 5,000.00 \times 12 = \text{GH¢ } 60,000.00
$$

$$
\text{Brako's yearly income} = \text{GH¢ } 6,500.00 \times 12 = \text{GH¢ } 78,000.00
$$

$$
\text{Dagadu's yearly income} = \text{GH¢ } 4,200.00 \times 12 = \text{GH¢ } 50,400.00
$$
*   **Aku: $\boxed{\text{GH¢ } 60,000.00}$**
*   **Brako: $\boxed{\text{GH¢ } 78,000.00}$**
*   **Dagadu: $\boxed{\text{GH¢ } 50,400.00}$**

$$
\text{Difference} = \text{GH¢ } 60,000.00 - \text{GH¢ } 50,400.00 = \text{GH¢ } 9,600.00
$$
*   **Difference: $\boxed{\text{GH¢ } 9,600.00}$**

$$
\text{Total income} = \text{GH¢ } 60,000.00 + \text{GH¢ } 78,000.00 + \text{GH¢ } 50,400.00 = \text{GH¢ } 188,400.00
$$
*   **Total income: $\boxed{\text{GH¢ } 188,400.00}$**

The building forms the vertical side, the ground forms the horizontal side, and the ladder is the hypotenuse.  
Let $L$ be the length of the ladder, $