Let

be the average salary of an employee. Since the salary of the business man is 6 times the average salary of an employee, his salary will be

. We also know that the sum of the salary of the businessman and the average salaries of his 10 employees is 640000, so:

Solving for

:



The average salary of an employee is 4000, so the salary of the businessman will be

.
We can conclude that the business man's salary that year was 24000.