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. Calculate their yearly income, the difference between Aku's and Dagadu's yearly in

Aku's yearly income: $\text{GH¢ } 5,000.00 \times 12 = \boxed{\text{GH¢ } 60,000.00}$  
Brako's yearly income: $\text{GH¢ } 6,500.00 \times 12 = \boxed{\text{GH¢ } 78,000.00}$  
Dagadu's yearly income: $\text{GH¢ } 4,200.00 \times 12 = \boxed{\text{GH¢ } 50,400.00}$

Aku's yearly income = GH¢ 60,000.00.  
Dagadu's yearly income = GH¢ 50,400.00.

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

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