Adom earns GH¢2500 a month after tax and his elder brother Arko earns three times as much. How much is their total income after five years if there are no increment in their earnings.

The number is "Two million, four hundred and eight thousand, three hundred and twenty-one."

• "Two million" corresponds to 2,000,000.
• "four hundred and eight thousand" corresponds to 408,000.
• "three hundred and twenty-one" corresponds to 321.

Add the values from Step 1:

$$2,000,000 + 408,000 + 321 = 2,408,321$$

The calculated number is 2,408,321.
Option A: 2,4008,321
Option B: 2,408,321
Option C: 248,321
Option D: 2,4080,321
The correct option is B.

The final answer is $\boxed{\text{B. } 2,408,321}$.