Final answer:
The sales manager's annual income is calculated by adding the fixed monthly salary multiplied by 12 to the commission earned, which is 1/3 % of the annual sales.
Step-by-step explanation:
The question pertains to calculating the annual income of a sales manager who earns a fixed salary plus a commission on sales. To determine the annual income, we have to consider the fixed monthly salary and the commission earned from total sales. The sales manager earns a fixed salary of Rs 4000 per month and an additional commission of 1/3 % of the total sales which amounts to Rs 60,00000 in the year.
Firstly, calculate the annual salary which is Rs 4000 multiplied by 12 months. Subsequently, calculate the commission by taking 1/3 % of the total sales of Rs 60,00,000. Finally, sum the annual salary and the commission to get the total annual income for the sales manager.