Given:
Salary = $400 a month
Rate of commission = 10%
Total sales = $2000
To find:
The total money you will make this month.
Solution:
We have,
Rate of commission = 10%
Total sales = $2000
Commission =

=

We know that,
Total money = Salary + Commission
=

=

Therefore, the total money you will make this month is $600.