Calculate Mr. Mambo's total annual income from rent, commissions, and dividends.

Mr. Mambo's income sources are:

• Rent from his houses: Sh 150 000
• Commissions: Sh 48 000
• Dividends on shares: Sh 210 000

Total income is the sum of all these sources.

$$\text{Total Income} = \text{Rent} + \text{Commissions} + \text{Dividends}$$ $$\text{Total Income} = \text{Sh } 150\,000 + \text{Sh } 48\,000 + \text{Sh } 210\,000$$ $$\text{Total Income} = \text{Sh } 408\,000$$

To calculate the income tax Mr. Mambo should pay, the specific income tax rates or tax brackets are required, which are not provided in the question. Assuming these rates would be necessary to determine the final tax amount.

The total annual income for Mr. Mambo is $\text{Sh } 408\,000$.